计算机机试复试3

1determine how many prime numbers there are from 101 to 200

#include<stdio.h>
#include<math.h>
int main(){
    int i,j,k;
    for(i = 101;i<=200;i++){
        j = sqrt(i);
        for(k=2;k<=j;k++){
            if(i%k == 0){
                break;
            }    
            else{
                printf("%d\t",i);
                break;
            }
        }
        
    }
}

2A three-digit number ,the sum of the cubes of each number is equal to the number

daffodil number

#include<stdio.h>
int main(){
    int i,j,k;
    for(i=0;i<=9;i++)
        for(j=0;j<=9;j++)
            for(k=0;k<=9;k++){
                if(i*i*i+j*j*j+k*k*k==100*i+10*j+k){
                    printf("%d\t",100*i+10*j+k);
                }
            }
}

3decompose an integer into prime number

#include <stdio.h>

int main(void) {
    int n,i;
    printf("\nplease input a number:\n");
    scanf("%d",&n);
    printf("%d=",n);
    for(i=2;i<=n;i++){
        while(n!=i){
            if(n%i==0){
                printf("%d*",i);
                n=n/i;
            }
            else{
                break;
            }
        }
    }
    printf("%d",n);

}

4conditional operator

#include <stdio.h>

int main(void) {
    int i,j;
    printf("please iunput score");
    scanf("%d",&i);
    //j=(i>90)?'A':'B';conditional operator must have an output result
    j=(i>90)?'A':(i>60)?'B':'C';
    printf("j=%c",j);//to use english characters in C langage ,single quotation musts be used
}

5