Question

I’ve seen a solution to this already on here but I prefer an argument that actually uses strdup to replace the occurences of the old with the new. Thanks!

2. (20 points) Do the following: (a) Write a C function definition for a replace function that uses the following prototype. void replace(char *str, char old, char neu); where the argument supplied for str is left with all occurrences of old replaced with ne , char new); (b) Call your function with the variables my.str, old and nes, declared as: char* my.str char old 'c , ; char new'b' /the result of strdup of an existing cstring

Answer 1

#include <stdio.h>
#include <stdlib.h>
#define MAX 100
// Defines a function to replace old character with newc character in the string str
void replace(char *str, char old, char newc)
{
// Loop variable
int c;
// Loops till end of the string
for(c = 0; str[c] != '\0'; c++)
// Checks if character at c index position of the string str
// is equals to parameter old character
if(str[c] == old)
// Assigns the parameter newc character at c index position of string str
str[c] = newc;
}// End of the function

// main function definition
int main()
{
// Creates a pointer type character
// Allocates memory for 20 characters using malloc function
char *str = (char *) malloc(sizeof(char) * MAX);
// Declares a variable and assigns character 'c' to replace
char old = 'c';
// Declares a variable newc and assigns character 'd' to replace with
// new is a keyword so variable is newc
char newc = 'd';

// Accepts a string from the user till '\n' (new line character entered by the user)
printf(" Enter a string: ");
scanf("%[^\n]", str);

// Displays the string before replacement
printf("\n Before replace '%c' with '%c' %s", old, newc, str);

// Calls the function to replace old with newc
replace(str, old, newc);

// Displays the string after replacement
printf("\n After replace '%c' with '%c' %s", old, newc, str);
}// End of the main function

Sample Output:

Enter a string: check this chiken for cooking

Before replace 'c' with 'd' check this chiken for cooking
After replace 'c' with 'd' dhedk this dhiken for dooking