Convert Lowercase to Uppercase using String in C


This program is about converting a string from uppercase to lowercase using for loop and if conditions without using any predefine functions.

Source Code

#include<stdio.h>
int main()
{
  int i;
  char a[100];
  printf("\nEnter the First String:");
  gets(a);
  printf("\nGiven First String:");
  puts(a);
  for(i=0;a[i]!='\0';i++)
  {
    if(a[i]>=65&&a[i]<=90)
    {
       a[i]+=32;
    }
  }
  printf("\nLower case Value is:%s",a);
  return 0;
}
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Output

Enter the First String: TUTOR JOE'S
TUTOR JOE'S

Given First String:TUTOR JOE'S

Lower case Value is:tutor joe's

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