20131002国庆作业第三章例3-1,3-2,3-3

3-1

运行结果1

结果2

#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!\n");
    else
        if(yournumber>mynumber)
            printf("Sorry!your number is bigger than my number!\n");
        else
            printf("Sorry!your number is smaller than my number!\n");

    return 0;
}

3-2

运行结果1

结果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.\n");
    }
    else{
        printf("The number is odd.\n");
    }

    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\n",total/n);
    printf("Number of failures=%d\n",count);
    
    return 0;
}