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C program to capitalize first character of each word in a string

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mahmoud2506
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2022-05-03
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C program to capitalize first character of each word in a string

In this program, we will learn how to capitalize each word of input string using C program?

This program will read a string and print Capitalize string, Capitalize string is a string in which first character of each word is in Uppercase (Capital) and other alphabets (characters) are in Lowercase (Small).

For example:
If input string is "hello friends how are you?" then output (in Capitalize form) will be "Hello Friends How Are You?".

 

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mahmoud2506
2022-05-03
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Program to capitalize first character of each word in a string in C

#include <stdio.h>
#define MAX 100

int main()
{
	char str[MAX]={0};	
	int i;
	
	//input string
	printf("Enter a string: ");
	scanf("%[^\n]s",str); //read string with spaces
	
	//capitalize first character of words
	for(i=0; str[i]!='\0'; i++)
	{
		//check first character is lowercase alphabet
		if(i==0)
		{
			if((str[i]>='a' && str[i]<='z'))
				str[i]=str[i]-32; //subtract 32 to make it capital
			continue; //continue to the loop
		}
		if(str[i]==' ')//check space
		{
			//if space is found, check next character
			++i;
			//check next character is lowercase alphabet
			if(str[i]>='a' && str[i]<='z')
			{
				str[i]=str[i]-32; //subtract 32 to make it capital
				continue; //continue to the loop
			}
		}
		else
		{
			//all other uppercase characters should be in lowercase
			if(str[i]>='A' && str[i]<='Z')
				str[i]=str[i]+32; //subtract 32 to make it small/lowercase
		}
	}
	
	printf("Capitalize string is: %s\n",str);
	
	return 0;
}

Output

First run:
Enter a string: HELLO FRIENDS HOW ARE YOU?
Capitalize string is: Hello Friends How Are You?

Second run:
Enter a string: hello friends how are you?
Capitalize string is: Hello Friends How Are You?

Third run:
Enter a string: 10 ways to learn programming.
Capitalize string is: 10 Ways To Learn Programming.

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