C Program to print the first digit of a given number

Description

Get input num and display the first digit of number num
Input:
675
Output:
6

Solution

#include<stdio.h>
int main()
{
	int n,num;
	scanf("%d",&num);
	n=num;
	while(num>=10)
	{
		num/=10;
	}
	printf("%d is the first digit in %d",num,n);
	return 0;
}
		

Explanation

Instruction(s) inside the while block{} are executed repeatedly till  expression (num>=10) is true.

Divide the number num by 10 untill it becomes lesser than 10. once it is less than 10 print the num using printf statement.

statement num = num/10 divides the num by 10 repeatedly untill it num is less than 10.



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