Could you please complete with steps and explanations. thank you. #include<stdio

Question

Could you please complete with steps and explanations. thank you.

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main(){
char fname[20];
printf("Enter your first name again: ");
scanf("%s", fname);
  
int len = strlen(fname); // length of first name
  
// declare another string of same length (dynamic declaration)
char *str = (char *) malloc(sizeof(char) * len + 1);
  
// initialize the string with '_'s
initializeBlankString(str, len);
  
char c;
printf("Enter a letter: ");
getchar();
scanf("%c", &c);

// check if the letter is present in your first name
int check = checkLetter(fname, c);

// If present, put that letter in the exact same position in the 2nd string (filled with '_'s)

int flag = revealGuessedLetter(c, str, fname);   
  
// Output if the second string has been updated and print both the strings

return 0;
}

/* Complete the functions */

revealGuessedLetter( , , ){

}

Explanation / Answer

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

void initializeBlankString(char [], int);

int checkLetter(char *, char);

int revealGuessedLetter(char, char *, char *);

int main(){

char fname[20];

printf("Enter your first name again: ");

scanf("%s", fname);

int len = strlen(fname); // length of first name

// declare another string of same length (dynamic declaration)

char *str = (char *) malloc(sizeof(char) * len + 1);

// initialize the string with '_'s

initializeBlankString(str, len);

char c;

printf("Enter a letter: ");

getchar();

scanf("%c", &c);

// check if the letter is present in your first name

int check = checkLetter(fname, c);

// If present, put that letter in the exact same position in the 2nd string (filled with '_'s)

if (check == 1) {

int flag = revealGuessedLetter(c, str, fname);

if(flag == 1) {

printf("Entered string %s ", fname);

printf("Modified string %s ", str);

}

}

// Output if the second string has been updated and print both the strings

return 0;

}

/* Complete the functions */

void initializeBlankString(char str[], int len) {

int i;

for (i=0; i<len; i++) {

str[i] = '_';

}

str[i]='';

}

int checkLetter(char *fname, char letter){

int i=0;

while (fname[i] != '') { //looping till end of fname

if(fname[i] == letter)

return 1; //if found letter in fname, return 1

i++; //increasing index

}

//else it will default return 0 as not found

return 0;

}

int revealGuessedLetter(char c, char *str, char *fname) {

int i=0;

while (fname[i] != '') { //looping till end of fname

if(fname[i] == c)

str[i] = c;

i++;

}

return 1;

}

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