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Hexadecimal Number To Decimal Number Using C++ ( With Condition Check)

 => Program :


#include<iostream>

#include<math.h>

using namespace std;


string low2up(string passStr){


string changeStr=passStr;


for(int i=0;i<changeStr.size();i++){


     if(passStr[i]>=97 && passStr[i]<=122)

      {

changeStr[i]=changeStr[i]-32;

      }

}

return changeStr;


}


bool validHexVal(string checkSr){

bool checkValid;

int countNum=0;

for(int i=0;i<checkSr.size();i++){


     if(checkSr[i]>=65 && checkSr[i]<=70)

      {

countNum++;

      }


      if(checkSr[i]>=48 && checkSr[i]<=57){

        countNum++;

      }

}


if(checkSr.size()==countNum){

    return true;

}else{

    return false;

}


}


int main(){

int decNum=0,val;

string hexNum,upperHexNum;

cout<<"Enter the hex decimal number "<<endl;

cin>>hexNum;


upperHexNum=low2up(hexNum);


int n=upperHexNum.size();

if(validHexVal(upperHexNum)){


 for(int i=n-1;i>=0;i--){

    if(upperHexNum[i]>=65 && upperHexNum[i]<=70)

      {

val=char(upperHexNum[i])-55;

      }else{

        val=char(upperHexNum[i])-48;

      }

      decNum=decNum+val*pow(16,n-(i+1));

 }


cout<<"Decimal Value : "<<decNum<<endl;


}else{

   cout<<"Not Valid Hexadecimal Value";

}

}



=> Output:




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