I want to figure out if the book is right or the compiler is right. | | cc | | 邮箱：caipenghui_c(a)163.com | 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. | | cc | | 邮箱：caipenghui_c(a)163.com | 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 &lt;caipenghui_c(a)163.com&gt; 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; } | | cc | | 邮箱：caipenghui_c(a)163.com | 签名由 网易邮箱大师 定制

Ok, That you. | | cc | | 邮箱：caipenghui_c(a)163.com | 签名由 网易邮箱大师 定制 On 08/22/2018 22:32, Ralph Corderoy wrote: 5050 is the right answer. It's the 100th triangular number. https://en.wikipedia.org/wiki/Triangular_number Please let this off-topic thread die. -- Cheers, Ralph. https://plus.google.com/+RalphCorderoy

On August 22, 2018 11:40:18 PM GMT+08:00, Toby Thain &lt;toby(a)telegraphics.com.au&gt; wrote: Thank you very much for pointing this out, and I'm thrilled. Thank you for your kind help.