Pass a string to a function: Invert the case of the letters within a string : function parameters « Function « C++ Tutorial

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C++ Tutorial » Function » function parameters

7.3.10.Pass a string to a function: Invert the case of the letters within a string

#include <iostream> 

#include <cstring> 

#include <cctype>  

using namespace std; 

 

void f(char *str); 

 

int main() 

{ 

  char str[80]; 

 

  strcpy(str, "ABCD"); 

 

  f(str); 

 

  cout << str; 

  return 0; 

} 

 

 

void f(char *str) 

{ 

  while(*str) { 

    if(isupper(*str)) 

        *str = tolower(*str);  

    else if(islower(*str)) 

        *str = toupper(*str); 

    str++; 

  } 

}

abcd

7.3.function parameters
	7.3.1.	Passing int by value
	7.3.2.	Define function to accept three int parameters
	7.3.3.	Pass a pointer to a function.
	7.3.4.	Pass variable address to a function
	7.3.5.	Pass int array to a function
	7.3.6.	Declare int array parameter for a function without indicating the array length
	7.3.7.	Function parameter: Use int pointer to accept an array
	7.3.8.	Use array as function's parameter
	7.3.9.	Change the contents of an array using a function
	7.3.10.	Pass a string to a function: Invert the case of the letters within a string
	7.3.11.	Change a call-by-value parameter does not affect the argument
	7.3.12.	Demonstrate the pointer version of swap(): Exchange the values of the variables pointed to by x and y
	7.3.13.	Using reference parameters
	7.3.14.	Passing a two-dimensional array to a function
	7.3.15.	Passing an array to a function
	7.3.16.	var args has to be the last one
	7.3.17.	the use of ... and its support macros va_arg, va_start, and va_end
	7.3.18.	Handling an array parameter as a pointer

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