C Programming Code Examples
C > For Loops and While Loops Code Examples
Program to find sum of first and last digit without using loop
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/* Program to find sum of first and last digit without using loop
Write a C program to input a number and find sum of first and last digit of the number using for loop. How to find sum of first and last digit of a number in C programming using loop. Logic to find sum of first and last digit of a number without using loop in C program.
C program to find sum of first and last digit of a number */
#include <stdio.h>
#include <math.h>
int main()
{
int j, sum, digits, firstDigit, lastDigit;
sum = 0;
/* Input a number from user */
printf("Enter any number to find sum of first and last digit: ");
scanf("%d", &j);
/* Find last digit */
lastDigit = j % 10;
/* Find total number of digits - 1 */
digits = (int) log10(j);
/* Find first digit */
firstDigit = (int) (j / pow(10, digits));
/* Calculate the sum */
sum = firstDigit + lastDigit;
printf("Sum of first and last digit = %d", sum);
return 0;
}
The for loop is used in the case where we need to execute some part of the code until the given condition is satisfied. The for loop is also called as a per-tested loop. It is better to use for loop if the number of iteration is known in advance. The for-loop statement is a very specialized while loop, which increases the readability of a program. It is frequently used to traverse the data structures like the array and linked list.
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