Write a program that reverses a string with the following features: 1. In the ma

Question

Write a program that reverses a string with the following features: 1. In the main function, ask the user to enter a string. 2. The entered string can be handled as C-string (or converted to C-string). 3. Write a reverseString function that takes the string parameter (C-string or char *) and reverse it. 4. In the main function, print out the original string and the reversed string. 5. The reverseString function must be implemented using pointer notation. 6. Using non-pointer notations to implement reverseString will result in a 3-point deduction. 7. Using library functions to do reserve will result in a 5-point deduction. (It is OK to use a function to get string?s length. It?d even better to count the length in the code).

Explanation / Answer

#include<stdio.h>

#include <string.h>

void reverseString(char *str)

{

int length = (int)strlen(str);

int i=0,j=length-1;

char temp;

while(i<j)

{

temp = *(str+i);

*(str+i) = *(str+j);

*(str+j) = temp;

i++;

j--;

}

}

int main()

{

char *str;

printf("Input a string : ");

gets(str);

printf("String is : ");

puts(str);

reverseString(str);

printf("String after reversing is : ");

puts(str);

return 0;

}

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