Question

C programming language:

If you malloc, make sure to assert and free the data.

please do not call any function you don't write yourself other than: malloc, free, assert, sizeof, scanf/printf families (eg., sprintf, fprintf & printf all OK to use)

Write a function whose only argument is the input string. The function should return a new string which consists of only the upper case letters from the original string. The new string should be allocated to use the minimum legal storage, and it should be returned to the caller. So, if the input string is "Hello My Good Friend", this function should return the string "HMGF" without changing the input string. You cannot call any functions that you don't write in answer to this question. It may help you to know that the upper-case characters are between 65-90 (inclusive ) in ASCII value (i.e. 'A'=65, and 'Z'=90). The input string will be either a valid string or NULL.

Answer 1

#include<stdio.h>
#include<stdlib.h>
//function to extact all capitals from the input string
char* capitals(char* input)
{
   char *output;
   //calculate the length of input string
   int size = sizeof(input)/sizeof(input[0]);
   //create an output string with the same length
   output = malloc(size);
   int i = 0, j = 0;
   //iterate over the input string
   while(input[i] != '\0')
   {
       //if the current letter is capital
       if(input[i] >= 65 && input[i] <= 91)
       {
           //add it to output string
           output[j] = input[i];
           //increment the index of output string
           j++;
       }
       //increment the index of input string
       i++;
   }
   return output;
}
int main()
{
   //initialize the string
   char input[] = "Hello My Good Friend";
   //call the function for output
   char *output = capitals(input);
   //print the output
   printf("%s\n", output);
   free(output);
}

Activities Terminal Fri 21:29 deepika@deepika-TravelMate-P243-M: -/Desktop File Edit View Search Terminal Help deepika@deepika-TravelMate-P243-M:-/Desktops gcc all_capital.c deepika@deepika-TravelMate-P243-M:-/Desktop$ ./a.out HMGF deepika@deepika-TravelMate-P243-M:-/Desktops |

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