By | 29.11.2016

# C Program to find First Capital Letter in String

Write a C Program to find First Capital Letter in String using Recursion. Here’s simple Program to find First Capital Letter in String using Recursion in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

### Problem : :

The following C program, using recursion, finds the first capital letter that exists in a string. We have included ctype.h  in order to make use of “isupper(char);” function that’s defined inside the ctype.h headerfile.

The isupper() function returns 1 if the passed character is an uppercase and returns 0 is the passed character is a lowercase.

Here is the source code of the C program to find the first capital letter in a string using recursion. The C program is successfully compiled and run on a Windows system. The program output is also shown below.

### SOURCE CODE : :

```/* C program to find the first capital letter in a string using recursion */

#include <stdio.h>
#include <string.h>
#include <ctype.h>

char caps_check(char *);

int main()
{
char string[20], letter;

printf("Enter a string to find it's first capital letter: ");
scanf("%s", string);
letter = caps_check(string);
if (letter == 0)
{
printf("No capital letter is present in %s.\n", string);
}
else
{
printf("The first capital letter in %s is %c.\n", string, letter);    }
return 0;
}
char caps_check(char *string)
{
static int i = 0;
if (i < strlen(string))
{
if (isupper(string[i]))
{
return string[i];
}
else
{
i = i + 1;
return caps_check(string);
}
}
else return 0;
}```

### Output :

```************OUTPUT*********************

Enter a string to find it's first capital letter: codezClub

The first capital letter in codezClub is C.```

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