Convert string to upper case and lower case : String Case « String « C / ANSI-C

1.	assert.h
2.	Console
3.	ctype.h
4.	Data Structure Algorithm
5.	Data Type
6.	Development
7.	File
8.	Function
9.	Language Basics
10.	Macro Preprocessor
11.	Math
12.	math.h
13.	Memory
14.	Pointer
15.	setjmp.h
16.	signal.h
17.	Small Application
18.	stdio.h
19.	stdlib.h
20.	String
21.	string.h
22.	Structure
23.	time.h
24.	wctype.h

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Convert string to upper case and lower case



  

#include <ctype.h>

#include <stdio.h>



int main(void)

{



  char str[80];

  int i;



  printf("Enter a string: ");

  gets(str);



  for( i = 0; str[ i ]; i++)

    str[ i ] = toupper( str[ i ] );



  printf("%s\n", str); /* uppercase string */



  for(i = 0; str[ i ]; i++)

    str[i] = tolower(str[ i ]);



  printf("%s\n", str); /* lowercase string */



  return 0;

}

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