11.4

循序存取阵列元素

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int c[6]=0;
    int a;
    for(a =1;a<=6000;a++){
        int num =rand()%6+1;
    switch(num){
        case 1:c[0]++;break;
        case 2:c[1]++;break;
        case 3:c[2]++;break;
        case 4:c[3]++;break;
        case 5:c[4]++;break;
        case 6:c[5]++;break;
    }         //计算掷6000次骰子个点被掷到的次数 
  }
     printf("%d\n",c[0]);
      printf("%d\n",c[1]);
       printf("%d\n",c[2]);
        printf("%d\n",c[3]);
         printf("%d\n",c[4]);
          printf("%d\n",c[5]);
          return 0;
}

简化后：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int c[6]={0};   //c是每个点的次数
    int n,t;     //n是次数，t代表六个点
    for(n=1;n<=6000;n++){
       int d =rand()%6+1;
        for(t=1;t<=6;t++){
            if (d ==t){
                c[t-1]++;
            }
        }
    }
    for(t = 1;t<=6;t++){
        printf("%d: %d",t,c[t-1]);
    }
    return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int c[6]={0};   //c是每个点的次数
    int n;     //n是次数
    for(n=1;n<=6000;n++){
       int d =rand()%6+1;
        c[d-1]++;
        }
    }
    for(t = 1;t<=6;t++){
        printf("%d: %d",t,c[t-1]);
    }
    return 0;
}

#include<stdio.h>
int main(){
    int a[5]={90,75,83,89,71};
        int n,b,sum=0;
    do{
        scanf("%d",&n);
        if(id!=0){
            sum = sum +a[n-1];
        }
                             //简化计算总价(更有弹性)
    }while(n!=0);
        printf("%d\n",sum);
        return 0;
    }

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main(){
    srand(time(0));
    int i,n;
    int c[11]={0};
    for(i=1;i<=100000;i++){
        int dice1 =rand()%6+1;
        int dice2 =rand()%6+1;
        int sum =dice1+dice2;
            c[sum-2]++;
                       //掷两个骰子和的次数 
    }
    int a;
    for(a=2;a<=12;a++){
        printf("%d:%d\n",a,c[a-2]);
    }
    return 0;
}

#include<stdio.h>
int main(){
    int w,n,a[5];
    for(n=1;n<=5;n++){
        printf("第%d个数：",n);
        scanf("%d",&a[n-1]);
    }
    while(1){     
        printf("输入你要查第几个数：");
        scanf("%d",&w);
        if(w!=0){
            printf("%d\n",a[w-1]);
        }
    } 
    return 0;
}

while(1)直接执行代码块，条件判断结果为1（正确）

#include<stdio.h>
int main(){
    int b,s,n,a[10];
    for(n=1;n<=10;n++){
        printf("第%d个数：",n);
        scanf("%d",&a[n-1]);
    }
              //查询范围内的数字
    while(1){
        printf("请输入最小值和最大值：");
        scanf("%d%d",&s,&b);
        if(a==0&&b==0){
            break;
        }
        for(n=1;n<=10;n++){
            if(a[n-1]>s&&a[n-1]<b){
                printf("%d\n",a[n-1]);
            }
        }
    } 
    return 0;
}