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  • 20131002国庆作业例3-4,3-5,3-7

    3-4

    运行结果1

    结果2

    结果3

    #include<stdio.h>
    int main(void)
    {
        double x,y;
    
    
        printf("Enter x:");
        scanf("%lf",&x);
        if(x<0){
            y=0;
        }
        else if(x<=15){
            y=4*x/3;
        }
        else{
            y=2.5*x-10.5;
        }
    
        printf("f(%.2f)=%.2f
    ",x,y);
    
        return 0;
    }

    3-5

    #include<stdio.h>
    int main(void)
    {
        double value1,value2;
        char op;
    
        printf("Type in an expression:");
        scanf("%lf%c%lf",&value1,&op,&value2);
    
        if(op=='+')
            printf("=%.2f
    ",value1+value2);
        else if(op=='-')
            printf("=%.2f
    ",value1-value2);
        else if(op=='*')
            printf("=%.2f
    ",value1*value2);
        else if(op=='/')
            printf("=%.2f
    ",value1/value2);
        else
            printf("Unknown operator
    ");
    
        return 0;
    }

     3-7

    #include<stdio.h>
    int main(void)
    {
        int digit,letter,other;
        char ch;
        int i;
        digit=letter=other=0;
        printf("Enter 10 characters:");
        for(i=1;i<=10;i++){
            ch=getchar();
            if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
                letter++;
            else if(ch>='0'&&ch<='9')
                digit++;
            else
                other++;
        }
        printf("letter=%d,digit=%d,other=%d
    ",letter,digit,other);
    
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/baojunchi/p/3349665.html
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