C program to convert a string to sentence case

In this C program, we are going to learn how to convert a given string to sentence case? To implement this logic, we are creating a user define function to do the same.
Submitted by IncludeHelp, on April 05, 2018

Given a string and we have to convert it to sentence case using C program.

So, first of all, we have to understand - what is a sentence case? A string is in a sentence case, if first character of each sentence is an uppercase character.


    Input string: "hello how are you?"
    Sentence case string is: "Hello how are you?"

    Input string: "hello. how are you?"
    Sentence case string is: "Hello. How are you?"

Program to convert string to sentence case in C

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

// function to convert string to sentence case
void StrToSentence(char * string)
	int length=0,i=0;

	length = strlen(string);

		if( (i==0) && (string[i]>='a' && string[i]<='z'))
			string[i] = string[i] - 32;
		else if(string[i]=='.')
			if(string[i+1] == ' ')
				if(string[i+2]>='a' && string[i+2]<='z')
					string[i+2] = string[i+2] - 32;
				if(string[i+1]>='a' && string[i+1]<='z')
					string[i+1] = string[i+1] - 32;

// main function
int main()
	char string[50]={0};
	int length=0,i=0,j=0,k=0;

	printf("\nEnter the string : ");

	// pass the string to the function

	printf("Final string is : %s",string);
	return 0;


Run 1: 
Enter the string : hello world. how are you?
Final string is : Hello world. How are you?

Run 2:
Enter the string : hello.how are you? 
Final string is : Hello.How are you?

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