实验2 C语言分支与循环基础应用编程

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 5
#define N1 374
#define N2 465
int main()
{
int number;
int i;
srand( time(0) ); // 以当前系统时间作为随机种子
for(i = 0; i < N; ++i) {
number = rand()%(N2 - N1 + 1) + N1;
printf("202383290376%04d\n", number);
} r
eturn 0;
}
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 1 int main()
 2 {
 3 
 4     char a;
 5     while(1){
 6         scanf("%c",&a);
 7          if(a =='y'){
 8             printf("wait a minute");
 9         }else if(a == 'g'){
10             printf("go go go");
11             continue;
12         }else if(a =='r'){
13             printf("stop!");
14         }
15         if(a != 'y' ||a != 'g' || a != 'r'){
16             printf("something must be wrong...");
17         }
18         
19     }
20 
21     return 0;
22 }

#include<stdio.h>
int main(){

      int i,j;
     for(i = 1;i <= 9;i++){
        for(j = 1;j <=i;j++){
        printf("%d * %d = %d   ",i , j ,i*j);
        }
        printf("\n");
     }
     return 0;
}