C program to check whether a number is Armstrong or not

Definition of Armstrong Number

Those numbers which sum of the cube of its digits is equal to that number are known as Armstrong numbers. For example 153 since 1^3 + 5^3 + 3^3 = 1+ 125 + 9 =153 Other Armstrong numbers: 370,371,407 etc.

General definition of ArmStrong Number:

Those numbers which sum of its digits to power of number of its digits is equal to that number are known as Armstrong numbers.

Example 1:

153
Total digits in 153 is 3
And 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153

Example 2:

1634
Total digits in 1634 is 4
And 1^4 + 6^4 + 3^4 +4^4 = 1 + 1296 + 81 + 64 =1634

Examples of Armstrong numbers:

1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725

# include <stdio.h>
int main(){
    int num,r,sum=0,temp;

    printf("Enter a number: ");
    scanf("%d",&num);

    temp=num;
    while(num!=0){
         r=num%10;
         num=num/10;
         sum=sum+(r*r*r);
    }
    if(sum==temp)
         printf("%d is an Armstrong number",temp);
    else
         printf("%d is not an Armstrong number",temp);

    return 0;
}

C program for finding armstrong no in a given range

Description Of Hello World Example

The stdio.h is a header file which provide standard input output library function like printf(), scanf() etc. To use the file, we need to include it in our program using #include preprocessor.

The main() function

In C code execution begins from main() function ( put main() function anywhere in the program ).

The code inside the curly braces { } is the body of main() function. The main() function is mandatory in C program.

#include < stdio.h >
int main(){
int num,r,sum,temp;
int min,max;

printf("Enter the minimum range: ");
scanf("%d",&min);

printf("Enter the maximum range: ");
scanf("%d",&max);

printf("Armstrong numbers in given range are: ");
for(num=min;num <=max;num++){
	 temp=num;
	 sum = 0;

	 while(temp!=0){
		 r=temp%10;
		 temp=temp/10;
		 sum=sum+(r*r*r);
	 }
	 if(sum==num)
		 printf("%d ",num);
}

return 0;
}

#include <stdio.h>
int main(){
    int num,r,sum=0,temp;

    printf("Enter a number: ");
    scanf("%d",&num);

    for(temp=num;num!=0;num=num/10){
         r=num%10;
         sum=sum+(r*r*r);
    }
    if(sum==temp)
         printf("%d is an Armstrong number",temp);
    else
         printf("%d is not an Armstrong number",temp);

    return 0;
}

#include <stdio.h>
int main(){
    int num,r,sum,temp;

    for(num=1;num <=500;num++){
         temp=num;
         sum = 0;

         while(temp!=0){
             r=temp%10;
             temp=temp/10;
             sum=sum+(r*r*r);
         }
         if(sum==num)
             printf("%d ",num);
    }

    return 0;
}