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error C2440

Scheduled Pinned Locked Moved C / C++ / MFC
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  • A Adam Roderick J

    Here, i think you have to help yourself, by learning the syntax of C. I prefer you to read a C programming book to get throught with syntax.:thumbsup: See in your code, you cannot use scanf as you wish, it is expecting the address of s. so your compiler is complaining

    scanf("%s",s);

    Expected code is

    scanf("%s",&s);

    Величие не Бога может быть недооценена.

    M Offline
    M Offline
    MsmVc
    wrote on last edited by
    #7

    Thanks for reply Now i am getting exception in line s[l]=0;

    Unhandled exception at 0x1026f8bc (msvcr90d.dll) in TestingProject.exe: 0xC0000005: Access violation reading location 0xcc006975.

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    0
    • M MsmVc

      Thanks for reply Now i am getting exception in line s[l]=0;

      Unhandled exception at 0x1026f8bc (msvcr90d.dll) in TestingProject.exe: 0xC0000005: Access violation reading location 0xcc006975.

      G Offline
      G Offline
      Game point
      wrote on last edited by
      #8

      try this

      char *s = new char;

      :~ Failure is Success If we learn from it!!:~

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      • G Game point

        try this

        char *s = new char;

        :~ Failure is Success If we learn from it!!:~

        M Offline
        M Offline
        MsmVc
        wrote on last edited by
        #9

        I have change in code char *s = new char(230) Still i have same exception. Please help me

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        • M MsmVc

          I all I got one example from planetsourcecode.When i compile these code then i am geeting error please help me.

          #include "stdafx.h"
          #include<stdlib.h>
          #include<stdio.h>
          #include<conio.h>
          #include<string.h>

          int _tmain(int argc, _TCHAR* argv[])
          {
          char *s;
          int i,l,*a,f,c,x;
          printf("Enter a string : ");
          scanf("%s",s);
          l=strlen(s);
          s[l]=0;
          a=(char*)malloc(l);
          for(i=0;i=l)

                  {
                  a\[x\]=c=0;
                  if(x<0){f=0;break;}
                  a\[x\]++;
              }
          }
          
          printf("Completed");
          
          return 0;
          

          }

          Error

          error C2440: '=' : cannot convert from 'char *' to 'int *'
          error C2109: subscript requires array or pointer type
          error C2143: syntax error : missing ';' before ')'

          Please help me

          F Offline
          F Offline
          Fareed Rizkalla
          wrote on last edited by
          #10

          You can use casting, I know it's available in C++. Don't know about C, does it have to be C or C++?

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          • F Fareed Rizkalla

            You can use casting, I know it's available in C++. Don't know about C, does it have to be C or C++?

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            MsmVc
            wrote on last edited by
            #11

            thank for make comment but sorry can you describe in detail.What's not available? please describe in detail.

            F 1 Reply Last reply
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            • M MsmVc

              thank for make comment but sorry can you describe in detail.What's not available? please describe in detail.

              F Offline
              F Offline
              Fareed Rizkalla
              wrote on last edited by
              #12

              i'm not sure if you've attempted to add float to an int data type, but you get compiler errors in the end. you want to add float and int to each other. Casting: int x = 12; float y = 4.0; int sum = x + (int)y;

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              • F Fareed Rizkalla

                i'm not sure if you've attempted to add float to an int data type, but you get compiler errors in the end. you want to add float and int to each other. Casting: int x = 12; float y = 4.0; int sum = x + (int)y;

                M Offline
                M Offline
                MsmVc
                wrote on last edited by
                #13

                Thank for reply but it's not useful for me because where i use int + float.If you have solution then please help me.

                1 Reply Last reply
                0
                • M MsmVc

                  I have change in code char *s = new char(230) Still i have same exception. Please help me

                  E Offline
                  E Offline
                  Emilio Garavaglia
                  wrote on last edited by
                  #14

                  no, no, no .... That's not the way to go! You put some code with some syntax error and even some misconception in it. That reveal that you are not understanding what your code has to do. The compiler just gives some errors, but those errors are random as your code is. Attempting to fix those errors doesn't lead anywhere: you're never granted your code will do what you expect. For example:

                  char \*s;
                  int i,l,\*a,f,c,x;
                  printf("Enter a string : ");
                  scanf("%s",s);
                  

                  s is a pointer pointing to nowhere: where do ypu thoing your scanf can write to ?!? s[l]=0; tries to write to nowhere since s is nowhere a is a pointer to int, but you do a=(char*)malloc(l): what did you want to do? allocating char-s or int-s ?!

                  for(i=0;i
                  f=1,c=0;
                  while(f)

                  This is a mess of tokens with no syntax meaning! Raed about the for syntax, and understand the proper use of '()', ',', and ';'. x=l-1 Wow... you're looking for problems: never use names like "O" and "l": I have to change font before find it's "l-1" and not "l-l" ... Do you get what I mean? If not, than that demonstrate the problem :-) Then: I see a malloc, but i don't see a free: not a good way to program... I don't continue, but what can you do if you don't have clear in your mind what you're gonna do?

                  2 bugs found. > recompile ... 65534 bugs found. :doh:

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                  • E Emilio Garavaglia

                    no, no, no .... That's not the way to go! You put some code with some syntax error and even some misconception in it. That reveal that you are not understanding what your code has to do. The compiler just gives some errors, but those errors are random as your code is. Attempting to fix those errors doesn't lead anywhere: you're never granted your code will do what you expect. For example:

                    char \*s;
                    int i,l,\*a,f,c,x;
                    printf("Enter a string : ");
                    scanf("%s",s);
                    

                    s is a pointer pointing to nowhere: where do ypu thoing your scanf can write to ?!? s[l]=0; tries to write to nowhere since s is nowhere a is a pointer to int, but you do a=(char*)malloc(l): what did you want to do? allocating char-s or int-s ?!

                    for(i=0;i
                    f=1,c=0;
                    while(f)

                    This is a mess of tokens with no syntax meaning! Raed about the for syntax, and understand the proper use of '()', ',', and ';'. x=l-1 Wow... you're looking for problems: never use names like "O" and "l": I have to change font before find it's "l-1" and not "l-l" ... Do you get what I mean? If not, than that demonstrate the problem :-) Then: I see a malloc, but i don't see a free: not a good way to program... I don't continue, but what can you do if you don't have clear in your mind what you're gonna do?

                    2 bugs found. > recompile ... 65534 bugs found. :doh:

                    M Offline
                    M Offline
                    MsmVc
                    wrote on last edited by
                    #15

                    Thanks for vital information and suggestion. I want to generate Combination of given String.Like this CString test="ABC", then generate like this AB AC AA BB BC BA CC CA CB If you have any type solution or suggestion then please help me.

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                    • M MsmVc

                      Thanks for vital information and suggestion. I want to generate Combination of given String.Like this CString test="ABC", then generate like this AB AC AA BB BC BA CC CA CB If you have any type solution or suggestion then please help me.

                      E Offline
                      E Offline
                      Emilio Garavaglia
                      wrote on last edited by
                      #16

                      Ok, that's the problem. Now try to come to an algorithmic solution. That doesn't need to be C or C++, just pseudocode. Only when you find your algorithm looks meaningful, try to code it! Than: the problem is not well formed. Do you want only two char-s combination? Does the input string needs to be 3 char-s wide or can it be whatever? Be sure about that: you risk to produce a code that works on a very specific case, while looking for something more generic.

                      2 bugs found. > recompile ... 65534 bugs found. :doh:

                      M 1 Reply Last reply
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                      • E Emilio Garavaglia

                        Ok, that's the problem. Now try to come to an algorithmic solution. That doesn't need to be C or C++, just pseudocode. Only when you find your algorithm looks meaningful, try to code it! Than: the problem is not well formed. Do you want only two char-s combination? Does the input string needs to be 3 char-s wide or can it be whatever? Be sure about that: you risk to produce a code that works on a very specific case, while looking for something more generic.

                        2 bugs found. > recompile ... 65534 bugs found. :doh:

                        M Offline
                        M Offline
                        MsmVc
                        wrote on last edited by
                        #17

                        yes you right.You have any idea about such type of algo because i havn't found algo.Please help me

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                        • M MsmVc

                          yes you right.You have any idea about such type of algo because i havn't found algo.Please help me

                          E Offline
                          E Offline
                          Emilio Garavaglia
                          wrote on last edited by
                          #18

                          no, I cannot do your homework.

                          2 bugs found. > recompile ... 65534 bugs found. :doh:

                          M 1 Reply Last reply
                          0
                          • E Emilio Garavaglia

                            no, I cannot do your homework.

                            2 bugs found. > recompile ... 65534 bugs found. :doh:

                            M Offline
                            M Offline
                            MsmVc
                            wrote on last edited by
                            #19

                            you don't do my home work just i want to know url link or forum name.i know why you do my home work. thank

                            1 Reply Last reply
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