C Exercises: Find perfect numbers within a given number of range
C For Loop: Exercise-28 with Solution
Write a c program to find the perfect numbers within a given number of range.
Sample Solution:
C Code:
/*Perfect number is a positive number which sum of all positive divisors excluding
that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3.
Sum of its divisor is 1 + 2+ 3 = 6*/
#include <stdio.h>
void main(){
int n,i,sum;
int mn,mx;
printf("Input the starting range or number : ");
scanf("%d",&mn);
printf("Input the ending range of number : ");
scanf("%d",&mx);
printf("The Perfect numbers within the given range : ");
for(n=mn;n<=mx;n++){
i=1;
sum = 0;
while(i<n){
if(n%i==0)
sum=sum+i;
i++;
}
if(sum==n)
printf("%d ",n);
}
printf("\n");
}
Sample Output:
Input the starting range or number : 1 Input the ending range of number : 50 The Perfect numbers within the given range : 6 28
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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