Before starting with program I recommend to read this Page .Will give you better Idea how the program will work
Here is the program to convert Hexadecimal number to Decimal Number
#include"conio.h"
#include"stdio.h"
#include"string.h"
#include"math.h"
int main()
{
char hex[25];
int i,j,num,len,counter=0;
long int sum=0; //value can cross range of int
printf("\nEnter the
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