HW22, C (gcc) - rextester

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// Stub program for Problem 2 HW 2 Fall 2016

#include  <stdio.h>

#define SIZE 30
#define ERROR -1

//////////////////////////////////////////////////////////////////////
// Function name: reverseString
//
//  Description: Reverses the order of the characters in a string.
//
//  Input/Output parameters:
//  *str, a pointer to the string whose characters are to be reversed,
//         the string is reversed in place and returned via the same
//         pointer.
//
//  Returns:
//
void reverseString(char* str) {
    // Your code goes here!
    int length= 0;
    
    while(str[length] != '\0'){
        length++;
    }
    
    char temp;
    int i=0;
    int j=0;
    
    j= length-1;
    
    while(i<j){
      temp = str[i];
      str[i] = str[j];
      str[j] = temp;
      i++;
      j--;
   }
    
}

int main(void)
{
    // my array for the string
    char myString[SIZE];

printf("\n*** Stub program for Problem 2 -- reverseString ***\n\n");
    
    // First read in an input string
    if (fgets(myString, SIZE, stdin)) {
        // input has worked, print out the original string
        printf("Read in the string \"%s\".\n\n",myString);
        // Call your routine
        reverseString(myString);
        // Print out the result
        printf("After function call the string is \"%s\".\n\n",myString);
    } else {
        printf("Error reading in the string!\n");
    }
    
    return 0;
}

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Compilation time: 0.12 sec, absolute running time: 10.04 sec, cpu time: 0 sec, memory peak: 0 Mb, absolute service time: 10,17 sec