#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,x;
for(i=1;i<=n;i++){
x=i+x;
}
return x;
}
int main(void) {
int a,b;
a = 3;
b = sum(a);
return 0;
}
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