#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 c=0;
int d=1;
while(d<=n){
c+=d;
d++;
}return c;
}
int main(void) {
int a,b;
a = 10;
b = sum(a);
return 0;
}
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