C Program to Capitalize the First and Last Letter of Each Word of a String

Capitalize first and last letter of each word

Today we will learn how to code a C program on how to Capitalize first and last letter of each word of a string i.e. to convert first and last letter of each word into uppercase . We will use toupper() function in the process. The toupper() function is used to convert lowercase alphabet to uppercase.

Capitalizing first and last letter

Algorithm:

  • Initialize the variables.
  • Accept the input.
  • Calculate the length of input.
  • Initialize a for loop and terminate it at the end of string. 
  • Convert first and last index of the string to uppercase using toupper() function.
  • Check for space and if space found convert the element present at index before space and after space to uppercase using the same function.
  • Print result. 

C programming code to capitalize the first and last letter of each word of a string

#include<stdio.h>
#include<conio.h>
#include <ctype.h>
#include<string.h>
int main()  {  //Initializing variables  char str[100] = "str ing";  int length = 0;    //Calculating length.  length = strlen(str);  for(int i=0;i<length;i++)  {      if(i==0||i==(length-1)) //Converting character at first and last index to uppercase.      {          str[i]=toupper(str[i]);      }      else if(str[i]==' ') //Converting characters present before and after space to uppercase.      {          str[i-1]=toupper(str[i-1]);          str[i+1]=toupper(str[i+1]);      }  }    //Printing result.  printf("String after capitalizing first and last letter of each word:\n%s", str);  return 0; }

Output

String after capitalizing first and last letter of each word:
StR InG

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