#includeint main (){int max(int x,int y);int a,b,c;scanf("%d,%d",&a,&b);c=max(a,b);//c小写printf("max=%d\n",c);return 0;}int max(int x,int y){int z;if (x>y)z=x;else z=y;return (z);}
另,输入格式应该是类似于1,2这样的形式,即整数间用逗号分隔