I want to figure out if the book is right or the compiler is right.


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cc
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邮箱：caipenghui_c@163.com
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签名由 网易邮箱大师 定制

On 08/22/2018 22:26, cc wrote:
Sorry, I won't be sending it next time. Oh oh, maybe I forgot to add; . I typed the code on the book, and the result of running the book was 5050, but the compiler was 100.


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cc
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邮箱：caipenghui_c@163.com
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签名由 网易邮箱大师 定制

On 08/22/2018 22:21, Dan Cross wrote:
Note, TUHS probably isn't the *best* forum to ask for help with basic C programs. :-)


That said, I suspect you mis-transcribed the program and that the line, `sum = sum + 1;` should be `sum = sum + i;`, or more idiomatically, `sum += i;`.  Indeed, the whole program could be written:


#include <stdio.h>


int
main(void)
{
        int i, sum = 0;
        for (i = 1; i <= 100; i++)
                sum += i;
        printf("%d\n", sum);
        return 0;
}


If you're using a C99 or later compiler, you can be slightly more succinct:


#include <stdio.h>


int
main(void)
{
        int sum = 0;
        for (int i = 1; i <= 100; i++)
                sum += i;
        printf("%d\n", sum);
        return 0;
}


Hope that helps!


       - Dan C.




On Wed, Aug 22, 2018 at 8:17 AM cc <caipenghui_c@163.com> wrote:

Hello everyone

I had a problem compiling a piece of c code from the book. The result of running the book is 5050, but the compiler is 100. I don't know which is right, please help me to see which is wrong. Thank you very much!

#include <stdio.h>

int main(void)
{
       int i, sum = 0;
       i = 1;
       while ( i <= 100) {
       sum = sum + 1;
       i++;
       }
       printf("%d\n", sum)
       return 0;
}




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cc
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邮箱：caipenghui_c@163.com
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签名由 网易邮箱大师 定制