#include <stdio.h>
//関数のプロトタイプ宣言
//ここ↓を埋めてね1
int max(int x, int y);
//main関数
int main(void) {
int a,b,c,d;
//ここ↓を埋めてね2
a=2; b=5; c=3; d=1;
printf("%dと%dと%dと%dのうち最も大きいのは%d",a
,b
,c
,d
,max
(max
(a
,b
),max
(c
,d
)));
return 0;
}
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね3
return (x>y) ? x: y;
}
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