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  • 例题第3章

    3.1

    #include<stdio.h>
    int main(void)
    {
        int mynumber=38;
        int yournumber;
    
        printf("Input your number:");
        scanf("%d",&yournumber);
        if(yournumber==mynumber)
            printf("Ok!you are right!
    ");
        else
            if(yournumber>mynumber)
                printf("Sorry!your number is bigger than my number!
    ");
            else
                 printf("Sorry!your number is smaller than my number!
    ");
    
                return 0;
    }

    3.2

    #include<stdio.h>
    int main(void)
    {
        int number;
    
        printf("Enter a number:");
        scanf("%d",&number);
        if(number % 2==0){
            printf("The number is even.
    ");
        }
        else{
            printf("The number is odd.
    ");
        }
    
        return 0;
    }

    3.3

    #include<stdio.h>
    int main(void)
    {
        int count,i,n;
        double grade,total;
    
        printf("Enter n:");
        scanf("%d",&n);
        total=0;
        count=0;
        for(i=1;i<=n;i++){
            printf("Enter grade #%d:",i);
            scanf("%lf",&grade);
            total=total+grade;
            if(grade<60){
                count++;
            }
        }
        printf("Grade average=%.2f
    ",total/n);
        printf("Number of failures=%d
    ",count);
        return 0;
    }

    3.4

    #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 valuel,value2;
        char op;
        printf("Type in an expression:");
        scanf("%lf%c%lf",&valuel,&op,&value2);
    
        if(op=='+')
            printf("=%.2f
    ",valuel+value2);
        else if(op=='-')
            printf("=%.2f
    ",valuel-value2);
        else if(op=='*')
            printf("=%,2f
    ",valuel*value2);
        else if(op=='/')
            printf("=%.2f
    ",valuel/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;
    }

    3.8

    #include<stdio.h>
    int main(void)
    {
        int choice,i;
        double price;
    
        for(i=1;i<=5;i++){
        printf("[1]Select crisps
    ");
        printf("[2]Select popcorn
    ");
        printf("[3]Select chocolate
    ");
        printf("[4]Select cola
    ");
        printf("[0]exit 
    ");
    
        printf("Enter choice:");
        scanf("%d",&choice);
    
        if(choice==0)
            break;
        switch(choice){
            case 1:price=3.0;break;
            case 2:price=2.5;break;
            case 3:price=4.0;break;
            case 4:price=3.5;break;
            default:price=0.0;break;
        }
        printf("price=%0.1f
    ",price);
        }
        printf("Thanks
    ");
    
        return 0;
    }

    3.9

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

    3.10

    #include<stdio.h>
    int main(void)
    {
        int blank,digit,other;
        char ch;
        int i;
        blank=digit=other=0;
        printf("Enter 10 characters:");
        for(i=1;i<=10;i++){
            ch=getchar();
            switch(ch){
            case' ':
            case'
    ':
                blank++;
                break;
            case'0':case'1':case'2':case'3':case'4':
            case'5': case'6':case'7':case'8':case'9':    
                digit++;
                break;
            default:
                other++;
                break;
            }
        }
        printf("blank=%d,digit=%d,other=%d
    ",blank,digit,other);
    
        return 0;
    }

    3.11

    #include<stdio.h>
    int main(void)
    {
        double value1,value2;
        char op;
    
        printf("Type is 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 == '/')
            if(value2!=0)
                printf("=%,2f
    ",value1/value2);
            else
                printf("Divisor can not be 0!
    ");
            else
                printf("Unknown operator!
    ");
    
                return 0;
    }

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  • 原文地址:https://www.cnblogs.com/simple9495/p/3398857.html
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