请各位帮的看看，两数相加，老是弄不对

＃include <stdio.h>
int main()
{
int integer1,integer2,sum;
printf("enter first integer\n");
scanf("%d",&integer1);
printf("enter second integer\n");
scanf("%d",&integer2);
sun=integer1+integer2;
printf("sum is %d\n",sun);
return0;
}

int main()? 通常应是 void main()
分清楚sum 和 sun

＃include <stdio.h>
int main()
{
int integer1,integer2,sum;
printf("enter first integer\n");
scanf("%d",&integer1); error:statement missing in function main
printf("enter second integer\n");
scanf("%d",&integer2);
sum=integer1+integer2; warning: possible use of "integer1"before definition in function main
printf("sum is %d\n",sum);
return 0;
}

这个提示是什么意思啊？？！！！