#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 main(void) {
int a,b,i;
a = 10;
for(i=1;i<=a;i++){
sum(a) == sum(a) +i;
b = sum(a);
}
return 0;
}
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