Python program Executing C++ Program Containing Functions

Python program Executing C++ Program Containing Functions

Now you are going to test the Python script to run a C++ program having functions and function calls.

Example 14.10.1 - Write a C++ program using a user defined function to function cube of a number

/*Write a C++ program using a user defined function to function cube of a number.*/

//Now select File→New in Notepad and type the C++ program

#include <iostream>

using namespace std;

Function declaration int cube(int num); int main()

{

int num; int c;

cout<<"Enter any number: "<<endl; cin>>num;

c = cube(num);

cout<<"Cube of " <<num<< " is "<<c; return 0;

}

//Function to find cube of any number int cube(int num)

{

return (num * num * num);

}

// Save this file as cube_file.cpp

#Now select File→New in Notepad and type the Python program

#Save the File as fun.py

#Program that compiles and executes a .cpp file

#Python fun.py -i c:\pyprg\cube_file.cpp

import sys, os, getopt

def main(argv):

cpp_file = ''

exe_file = ''

opts, args = getopt.getopt(argv, "i:",['ifile='])

for o, a in opts:

if o in ("-i", "--ifile"):

cpp_file = a + '.cpp'

exe_file = a + '.exe'

run(cpp_file, exe_file)

def run(cpp_file, exe_file):

print("Compiling " + cpp_file)

os.system('g++ ' + cpp_file + ' -o ' + exe_file)

print("Running " + exe_file)

print("-------------------")

print

os.system(exe_file)

print

if __name__ =='__main__':

main(sys.argv[1:])

Output of the above program

Compiling c:\pyprg\cube_file.cpp

Running c:\pyprg\cube_file.exe

-------------------

Enter any number:

5

Cube of 5 is 125