#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;
    	int result;
//ここ↓を埋めてね２
 printf("a? ");
    scanf("%d", &a);
    printf("b? ");
    scanf("%d", &b);
    printf("c? ");
    scanf("%d", &c);
    printf("d? ");
    scanf("%d", &d);
 
     result = max(max(a, b), max(c, d));
     printf("最大値 = %d\n", result);
     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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MSw1LGMsZA==

1,5,c,d