sharing balance

[tata123]

hello, i m a newbie in c++..i nid u all to help me..how to share the new_balance with void call() and void sms()?

#include<stdio.h>
void sms();
void call();
void topup();
void logo();

void main()
{
logo();
}

void logo()
{
printf("[1] Call, [2] SMS, [3] TOP UP, [4] EXIT ? ");
	scanf("%d", &choose);
	if(choose == 1)
	{
	printf("\nYou Have Choosen %s\n", "CALL");
	call();
	}
	else
	{
	}
	if(choose == 2)
	{
	printf("\nYou Have Choosen %s\n", "SMS");
	sms();
	}
	else
	{
	}
	if(choose == 3)
	{
	printf("\nYou Have Choosen %s\n", "TOP UP");
	topup();
	}
	else
	{
	}
	if(choose == 4)
	{
	printf("\nYou Have Choosen %s\n", "EXIT");
	logo();
	}
	else
	{
	}
}
void call()
{
double balance = 10.0, call_duration, new_balance;
printf("The Prepaid Balance = %.2lf\n", balance);
printf("Call Duration(minutes) : ");
scanf("%f", &call_duration);
new_balance = balance - (call_duration * 0.50);
printf("Your new balance = %.2lf", new_balance);
}
void sms()
printf("The Prepaid Balance = %.2lf\n", new_balance);

[weaknessforcats]

You need to create new_balance outside these functions. There's no sharing when each function has created its own new_balance.

Next, you pass the address of new_balance to each of the functions.

Next each function dereferences the address to use the shared new_balance.

float new_balance;
etc...
sms(&new_balance);
call)&new_balance);
etc...

Then inside he functions you dereference the address:

void sms(float* ptr)
{
   printf("%f", *ptr};
}

Here the function expects the address of a float. That is, a float pointer. The pointer, ptr, is the address of the float which makes *ptr the float itself. The function will work with any float so it is up to yu to pass in the address of the correct float.