[C++] 【c语言】自定义函数，形式参数和实际参数，goto语句

#include <stdio.h>

#include <stdio.h>
int add(int x,int y)
{
    int z;
    z = x + y;
    return z;
}
int main()
{
   int a = 10;
   int b = 20;
   int c;
   c =add(a,b);
   printf("%d\n",c);
   return 0;
}

#include <stdio.h>
int main()
{
   int a = 10;
   int b = 20;
   int c;
   c =a + b;
   printf("%d\n",c);
again:
   if(c == 30)
   {
       c++;
       goto again;
   }
   printf("okay\n");
   return 0;
}