Reverse string without using temp



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


void reverse(char *, int start, int end);
int main(int argc, char **argv) {

        if (sizeof(argv) > 1) {
                printf ("Given string :%s\n", *++argv);
                reverse(*argv, 0, strlen(*argv) - 1);
                printf ("String after reverse : %s\n", *argv);
        }
        return 0;
}

void reverse(char *str, int start, int end) {
        if (start < end) {
                str[start] = str[start] + str[end];
                str[end] = str[start] - str[end];
                str[start] = str[start] - str[end];
        } else return;
        reverse(str, start + 1, end - 1);
}
**argv equivalent to argv[][]
*argv is equivalent to *argv[0] , content of first index.


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