Question

write computer programming using switch case and check weather the number is perfect number or not​

Answer 1

Answer:

#include<stdio.h>

int main(){

int n,i=1,sum=0;

printf("Enter a number: ");

scanf("%d",&n);

while(i<n){

if(n%i==0)

sum=sum+i;

i++;

}

if(sum==n)

printf("%d is a perfect number",i);

else

printf("%d is not a perfect number",i);

return 0;

}

Result

Enter a number: 6

6 is a perfect number

Program 2

C program to print perfect numbers from 1 to 100

#include<stdio.h>

int main(){

int n,i,sum;

printf("Perfect numbers are: ");

for(n=1;n<=100;n++){

i=1;

sum = 0;

while(i<n){

if(n%i==0)

sum=sum+i;

i++;

}

if(sum==n)

printf("%d ",n);

}

return 0;

}

Result

Perfect numbers are: 6 28