#include <stdio.h>
int main(void)
{
int n1, n2, n3;
puts("3つの整数を入力してください。");
printf("整数n1:\n"); scanf("%d", &n1);
printf("整数n2:\n"); scanf("%d", &n2);
printf("整数n3:\n"); scanf("%d", &n3);
printf("それらの和は%dです。\n", n1 + n2 + n3);
return 0;
}
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