Question

PART A

Write c program.Please dount use fget

Write the statements to read a line of characters and create a new string by eliminating commas and blanks in the input string. Display the new string as given below:

Sample Run:

Enter a string: today, tomorrow, next day, will be cold.

Next string: todaytomorrownextdaywillbecold.

PART B

Please dont use fget.

Write a complete C program that removes extra spaces between words. Your main function should read the string entered by the user (you shall use gets function) and passes it to a function called clean. The function called clean should create a new string consisting of characters with no extra spaces between words. The main function should print this new string. A sample run is provided below:

Sample Run 1:

Enter source characters:hello world.

Result:hello world

Sample Run 2:

Enter source characters:hello my world.

Result:hello my world

Sample Run3:

Enter source characters:hello world.

Result:hello world

Answer 1

Hey here is answer to your question.

#include<stdio.h>
int Clean(char s[]){

   // looping over the character array
   // one note : we will loop until we reach the "\0" ending of string
   // as looping over the coundary will be waste of time as its no use to use
   // we only need the string we input
   for (int i = 0; s[i]!='\0'; i++){
       // now we check if character array element is "," or "." or tab("\t")
       // if its true dont print anything
       if (s[i]=='\t'|| s[i]==','|| s[i]=='.')
           printf("");
       // now for multiple blanks
       // we check if 2 consicative chars are white space then print nothing
       else if (s[i]==' ' && s[i+1]==' ')
           printf("");
       // now if there is a space and just next to it is a char other then space then it will print only one blank space
       else
           printf("%c",s[i]);
   }
  
   // just printing a new line at the end to make sure output is looking good  
   printf("\n");

}
void OutputWithoutWhitespceAndComma(char s[]){

   // this loop is also same as explained in upper function
   // with a little change
   for (int i = 0; s[i]!='\0'; i++)
       // now we check if character array element is whitespace or tab("\t")
       // if it is a whitespace print nothing
       if (s[i]==' ' || s[i]=='\t'|| s[i]==','|| s[i]=='.')
           printf("");
       //if it is not a white space then print the character
       else
           printf("%c",s[i]);
   // just printing a new line at the end to make sure output is looking good  
   printf("\n");      
}
int main(int argc, char const *argv[])
{  
   char s[2000]; // sample arrray to store input string
   char s2[2000];
   // now this is the trick in scanf of "C" if we dont put a parameter
   // it will use white space as limit upto where it have to read line
   // exaple "scanf("%s",s)" with input "hi there" will only read upto "hi"
   // so we give a parameter in "[]" so it will read upto that
   // in our case it will read upto newline("\n") character

   // Part A
   printf("Enter a string: ");
   scanf("%[^\n]s",s);
   printf("Next string: ");
   // printing wiout white spaces, Comma and blank.
   OutputWithoutWhitespceAndComma(s);

   // this line is for solveing the danglling new line problem
   //(if you want to test that issue comment the next line and run the program again)
   while ((getchar()) != '\n');

   //Part B
   puts("Enter source :");
   gets(s2);
   puts("Result:");
   Clean(s2);

   return 0;
}

In case of any doubt please comment. Happy Learning :)

note:- when compile this will give "Warning" that we should not use gets function but its ok as its not an error