The first problem is that the variable i has not been initialized. The second problem is that you are checking the wrong array index. See the comments in the modified version of your code below.

#include #include int main(){

int num\[50\], i, j;
int count = 0;

i = 0;  // Added this
printf("Enter your integer: \\n");

do{
	scanf(" %d", &num\[i\]);
	count++;
	
}while(num\[i++\]!=0);  // Changed this

for(j=1; j<= count; j++){
	
	if(num\[1\] > num\[j\]){
		num\[1\] = num\[j\];
	}
}

printf("%d is the greatest of them all !", num\[0\]);

return 0;

}