In C language, you can use loops to calculate sum. Here is an example code:
#include <stdio.h>
int main() {
int n, sum = 0;
printf("请输入一个整数 n:");
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
sum += i;
}
printf("1 到 %d 的和为:%d\n", n, sum);
return 0;
}
The program begins by taking an integer n input from the user, then it iteratively sums up from 1 to n, and finally outputs the result of the addition.