#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
scanf("%d,%d,%d,%d",&a
,&b
,&c
,&d
); int m;
m=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
int m;
m=x;
if (m<y){
m=y;
}
return m;
}
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