求一个简单C程序加法

#include<stdio.h>
main()
{
int x=1, y=2, z=3;
printf("%d\n",x+y+z);
}
就可以了

#include <stdio.h>

void main()
{
int x=1,y=2,z=3;
printf("%d",x+y+z);
}

#include<stdio.h>
int main(void)
{
int x=1,y=2,z=3;
printf("%d",x+y+z);
return 0;
}

#include<conio.h>
#include<stdio.h>

int main()
{
int x,y,z;
printf("x= ");
scanf("%d",&x);
printf("y= ");
scanf("%d",&y);
printf("z= ");
scanf("%d",&z);

printf("x+y+z = %d\n",x+y+z);

getch();
return 1;
}