Question

In a c programming

Write a program that converts upper case letters to lower case letters or vice versa:

Enter a sentence: What a GREAT movie is!

Converted sentence: wHAT_A_great_MOVIE_IS_

Convert all non-alphabetical letters to ‘_’

Answer 1

Please find the answer below.
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code.c

#include <stdio.h>

void convertCase(char * line){
   int i=0;
   char c;
   while (line[i] != '\0')
   {
       //get the char
       c = line[i];
       //convert to ascii
       int ascii = c;
       //if 97 to 122 is lowercase range
       //convert to ascii back to char
       char converted ;
       if(ascii>=97 && ascii<=122 ){
           //difference between uppercase and lower case is 32. if we deduct 32 from lower case it will convert to uppercase
           ascii-=32;
           //range 65 to 90 is uppercase range
           converted = ascii;
       }else if(ascii>=65 && ascii<=90){
           //if we will add 32 to upper case it will convert to lower case
           ascii+=32;
           converted = ascii;
       }else{
           converted = '_';
       }

       line[i] = converted;
       i=i+1;
   }
}
int main()
{
   char line[100];
   printf("Enter a sentence: ");
   gets(line);
   convertCase(line);
   printf("Converted sentence: %s",line);
   return 0;
}