#include <stdio.h>
//関数のプロトタイプ宣言
//ここ↓を埋めてね1
int max();
//main関数
int main(void) {
    int a,b,c,d;
//ここ↓を埋めてね2
a=1,b=7,c=3,d=4;
 printf("%d %d %d %d一番大きいのは%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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