#include <stdio.h>
int main(void)
{
int a, b;
puts("2つの整数を入力してください。");
printf("整数a:\n"); scanf("%d", &a);
printf("整数b:\n"); scanf("%d", &b);
printf("それらの平均は%dです。\n", (a + b) / 2);
return 0;
}
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