#include <stdio.h>
//課題B-1: 1からnまでの和を求めるコードを完成させてください
int sum (int n) {
int i , c;
for(i = 0; i <= n; i++){
c += i;
}
return c ;
}
int main(void) {
int a,b;
a = 10;
b = sum(a);
return 0;
}
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