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  • 循环

    一 while 循环

    int main()
    {
        int i = 0,sum = 0;
        while (i<101)
            {
                sum += i;
                i++;
            }
        printf("sum = %d",sum);
        return 0;
    }

      输出:

    sum = 5050
    Process returned 0 (0x0)   execution time : 0.265 s

      

    int main()
    {
        int i = 0;
        while (i<101)
            {
                if(i == 10)
                {
                    exit(0); //正常退出
                }
                printf("i = %d
    ",i);
                i++;
            }
    
        return 0;
    }

      输出:

    i = 0
    i = 1
    i = 2
    i = 3
    i = 4
    i = 5
    i = 6
    i = 7
    i = 8
    i = 9
    
    Process returned 0 (0x0)   execution time : 0.108 s

    二 do-while

      格式:

    #include <stdio.h>
    #include <stdlib.h>
    int main()
    {do{
            代码
        }
        while(条件);
    }

      示例:

    #include <stdio.h>
    #include <stdlib.h>
    int main()
    {
        int i = 0;
        do{
            i++;
            printf("%d
    ",i);
        }
        while(i<5);
    }

      输出:

    1
    2
    3
    4
    5
    
    Process returned 0 (0x0)   execution time : 0.119 s

    三 for循环

      格式:

    int main()
    {
        for (表达式1;表达式2;表达式3)
        {
           语句;
        }
        
    }

      注意:

        表达式1,表达式2,表达式3,均可省略,但是两个分号,绝不能省略。

      示例1 :

    int main()
    {
        int i;
        const int N = 6;
        double total_salary = 0.0;
        double single_salary;
        for (i = 0;i < N;i++)
        {
            printf("input %d months salarys:",i+1);
            scanf("%lf",&single_salary);
            total_salary += single_salary;
        }
        printf("totol_salary:%lf",total_salary);
    
    }

       

      示例2:

    int main()
    {
        int age;
        for (;;)
        {
            printf("input age:");
            scanf("%d",&age);
            if (age<0)
            {
                printf("age must > 0");
                break;
            }
        }
    }

      输出:

    input age:5
    input age:5
    input age:1
    input age:-5
    age must > 0
    Process returned 0 (0x0)   execution time : 9.275 s

    四  continue 与 break  的区别

      1 使用场合

        continue只能用于循环结构中

        break可以用于循环结构和switch中

      2 作用

        break 跳出循环体

        continue 跳过本次循环,执行下次循环

    五  实战

    int main()
    {
        int i = 0;
        int j;
        for (;i<6;i++)
        {
            for(j=0;j<=i;j++)
            {
                printf("%c",'*');  
            }
            printf("
    ");
        }
    
    

      注意:单引号与双引号的区别!!!!!!!!!!!!!!!!

      输出:

    *
    **
    ***
    ****
    *****
    ******
    
    Process returned 0 (0x0)   execution time : 0.051 s
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  • 原文地址:https://www.cnblogs.com/654321cc/p/9245764.html
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