计算机二级常见题型（2）

#include "stdio.h"
#include "stdlib.h"
int fun(int n){
    int *p;
    p=(int*) malloc(sizeof(int));
    *p=n;
    return *p;
}
int main(){
    int a;
    a=fun(10);
    printf("%d\n",a+fun(10));
}
malloc 是参生的指针需要释放free（p）；

#include "stdio.h"
int main(){
    int k=5;
    while(--k)
        printf("%d",k-=3);
}

#include "stdio.h"
int main(){
    int i,j;
    for (i=3;i>=1;i--){
        for(j=1;j<=2;j++){
            printf("%d",i+j);
            printf("\n");
        }
    }
}

#include "stdio.h"
int main(){
    int k=5,n=0;
    do{
        switch(k)
        {
        case 1:case 3:n+=1;
        k--;
        break;
        default:n=0;
        k--;
        case 2:case 4:n+=2;
        k--;
        break;
        }
        printf("%d",n);
    } while (k>0&&n<5);
}

#include "stdio.h"
int main(){
    int x=1,y=0;
    if(!x) 
        y++;
    else if(x==0)
        if(x)
            y+=2;
    else    
        y+=3;
    printf("%d\n",y);
}

#include "stdio.h"
int main(){
    int a=0,b=0;
    for(;a<7;a++)
    {
        if(a%2==0)
            continue;
        b+=a;
        continue;
    }
    printf("%d\n",b);
}

#include "stdio.h"
int main()
{
    char a='5',b;
    a++;
    printf("%d,%d\n",a-'5'+255,b=a-'5');
    return 0;
}

#include "stdio.h"
int main()
{
   int a=7,b=0;
   do{
       b+=a;
       a-=1;
   }while(a--);
    printf("%d,%d\n",b,a);
   return 0;
}

#include "stdio.h"
int main()
{
  int x,a=1,b=1;
  while(1)
  {
      scanf("%d",&x);
      if(x>0){a*=x;break;}
      if(x<0){b*=x;break;}
      printf("%d,%d\n",a,b);
  }
   return 0;
}