In this example, you will learn to convert a hexadecimal number to octal number. The program will take a hexadecimal number as an input from the user and convert it into a octal.
Example: Hexadecimal to Octal Conversion
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#include<iostream> #include<string.h> #include<math.h> using namespace std; int hex_to_oct(char hexval[]); int main() { char hexval[20],c; int n; cout<<"Enter Hexadecimal Number : "; cin>>hexval; cout<<"Octal Value of "<<hexval<<" is: "<<hex_to_oct(hexval); return 0; } int hex_to_oct(char hexval[]) { int i,len, dec=0, oct=0; for(len=0; hexval[len]!='\0'; len++); for(i=0; hexval[i]!='\0'; i++,len--) { if(hexval[i]>='0' && hexval[i]<='9') { dec= dec + (hexval[i]-'0')*pow(16,len-1); } if(hexval[i]>='A' && hexval[i]<='F') { dec = dec + (hexval[i]-55)*pow(16,len-1); } if(hexval[i]>='a' && hexval[i]<='f') { dec = dec + (hexval[i]-87)*pow(16,len-1); } } /* Now dec contains the decimal value of given hexadecimal number. */ i = 1; while(dec != 0) { oct = oct + (dec % 8) * i; dec = dec / 8; i = i * 10; } return oct; } |
When you run the program, the output will be following:
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Enter Hexadecimal Number : 7E Octal Value of 7E is: 176 |