第八次作业

1

#include<stdio.h>

main(){

       int i,j;

       for(i=1;i<=5;i++){

              for(j=1;j<=i;j++){

                     printf("*");

              }

              printf("\n");

       }

}

 

#include<stdio.h>

main(){

       int i,j,k;

       for(i=1;i<=4;i++){

              for(j=1;j<=i-1;j++){

                     printf(" ");}

                     for(k=1;k<=9-2*i;k++){

                            printf("*");

              }

              printf("\n");

       }

}

 

#include<stdio.h>

main(){

       int x,y;

       for(x=0;x<=35;x++){

       y=35-x;

       if(x*2+y*4==94)

              printf("鸡:%d只 兔:%d只\n",x,y);

}

}

 

#include<stdio.h>

main(){

       int i,j;

       for(i=1;i<=9;i++){

              for(j=1;j<=i;j++){

                     printf("%d*%d=%d\t",i,j,i*j);

}

printf("\n");

}

}

 

#include<stdio.h>

int main(){

       int num,i;

       printf("请输入一个数: ");

       scanf("%d",&num);

              for(i=2;i<=num-1;i++){

                     if(num%i==0)

                            break;

              }

              if(i<num)

              {

                     printf("%d不是质数",num);

              }

              else

              {

                     printf("%d是质数",num);

              }

              return 0;

}