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  4. converting char to unsigned int

converting char to unsigned int

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  • T thepersonof

    Hi I found that char could be converted to an interger as follows: char c = 250; int a = int(c) How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way? thank you

    A Offline
    A Offline
    Aqueel
    wrote on last edited by
    #6

    do you want the value of a to be 250 in this case? We Believe in Excellence www.aqueelmirza.cjb.net

    T 1 Reply Last reply
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    • A Aqueel

      do you want the value of a to be 250 in this case? We Believe in Excellence www.aqueelmirza.cjb.net

      T Offline
      T Offline
      thepersonof
      wrote on last edited by
      #7

      Thankyou ... converted to an unsigned char and it works great

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      • T thepersonof

        Hi I found that char could be converted to an interger as follows: char c = 250; int a = int(c) How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way? thank you

        W Offline
        W Offline
        Wim Engberts
        wrote on last edited by
        #8

        union { char c[sizeof (int)]; int n; } Convert; char c = 250; Convert.n = 0; Convert.c[0] = c; Then, in Convert.n you will get the proper value. Good luck! William

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        • T thepersonof

          Thankyou ... converted to an unsigned char and it works great

          A Offline
          A Offline
          Aqueel
          wrote on last edited by
          #9

          Yah i misunderstood. They are right. We Believe in Excellence www.aqueelmirza.cjb.net

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          • W Wim Engberts

            union { char c[sizeof (int)]; int n; } Convert; char c = 250; Convert.n = 0; Convert.c[0] = c; Then, in Convert.n you will get the proper value. Good luck! William

            C Offline
            C Offline
            Cedric Moonen
            wrote on last edited by
            #10

            Geez :omg: That's a really complicated way of doing that !

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            • W Wim Engberts

              union { char c[sizeof (int)]; int n; } Convert; char c = 250; Convert.n = 0; Convert.c[0] = c; Then, in Convert.n you will get the proper value. Good luck! William

              A Offline
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              Aqueel
              wrote on last edited by
              #11

              Chaa gia hai bhai! We Believe in Excellence www.aqueelmirza.cjb.net

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              • A Aqueel

                Chaa gia hai bhai! We Believe in Excellence www.aqueelmirza.cjb.net

                T Offline
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                thatsme_cool
                wrote on last edited by
                #12

                Kya cha gaya hai Yar

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                • T thatsme_cool

                  Kya cha gaya hai Yar

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                  Aqueel
                  wrote on last edited by
                  #13

                  hahahaha What a solution yaar! Nice Unique and innovative :-D We Believe in Excellence www.aqueelmirza.cjb.net

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                  • A Aqueel

                    hahahaha What a solution yaar! Nice Unique and innovative :-D We Believe in Excellence www.aqueelmirza.cjb.net

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                    toxcct
                    wrote on last edited by
                    #14

                    ...and you said what ? :confused:

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                    • T toxcct

                      ...and you said what ? :confused:

                      A Offline
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                      Aqueel
                      wrote on last edited by
                      #15

                      i said "Chaa gia hai bhai" which means "Great job! brother!". This is Urdu language idiom. It is used for a person who does something great. :) We Believe in Excellence www.aqueelmirza.cjb.net

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                      • T thepersonof

                        Hi I found that char could be converted to an interger as follows: char c = 250; int a = int(c) How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way? thank you

                        D Offline
                        D Offline
                        David Crow
                        wrote on last edited by
                        #16

                        thepersonof wrote:

                        int a = int(c)

                        A cast is actually not necessary. You could accomplish the same with:

                        int a = c;

                        because a char gets internally promoted to an int during such operations. A char can hold values in the range -128 to 127, whereas an unsigned char can hold values in the range 0 to 255.


                        "Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

                        "There is no death, only a change of worlds." - Native American Proverb

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                        • T thepersonof

                          Hi I found that char could be converted to an interger as follows: char c = 250; int a = int(c) How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way? thank you

                          A Offline
                          A Offline
                          abbiyr
                          wrote on last edited by
                          #17

                          Hi there. As the other replies have stated, you need to use the unsigned char for values above 127. To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts. unsigned char c = 250; int a = static_cast<int>(c); Cheers

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                          • A abbiyr

                            Hi there. As the other replies have stated, you need to use the unsigned char for values above 127. To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts. unsigned char c = 250; int a = static_cast<int>(c); Cheers

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                            David Crow
                            wrote on last edited by
                            #18

                            abbiyr wrote:

                            To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts.

                            For integral types, this is not necessary.


                            "Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

                            "There is no death, only a change of worlds." - Native American Proverb

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                            • D David Crow

                              abbiyr wrote:

                              To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts.

                              For integral types, this is not necessary.


                              "Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

                              "There is no death, only a change of worlds." - Native American Proverb

                              A Offline
                              A Offline
                              abbiyr
                              wrote on last edited by
                              #19

                              Quite agree. It is not necessary, the unsigned char will be cast correctly without it. I recommended it though, as it does explicity show the intentions of the developer.

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