编程题：a b c三个元素哪个大?

main()
{
int a,b,c,max;
scanf("%d%d%d",&a,&b,&c);
if (a>b)
max=a;
else
max=b;
if (max<c)
max=c;
printf("max=%d",max);
}

int a,b,c,x
printf("Input a,b,c :");
scanf("%d%d%d",&a,&,b,&c);
if(a<b){x=a:a=b:b=x};
if(a<c){x=a:a=c:c=x};
if(b<c){x=b:b=c:c=x};

main()
long int max,a,b,c;
scanf("%ld",&a);
scanf("%ld",&b);
scanf("%ld",&c);
max=a;
if max<b
max=b;
endif
if max<c
max=c;
else
max=max;
endif

printf("%ld",max);
return;

#include<stdio.h>
void main()
{
long int max,a,b,c;
scanf("%ld%ld%ld",&a,&b,&c);
max=a;
if max<b
max=b;
else if max<c
max=c;
printf("%ld",max);
}