String Reverse using Pointer

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#include<stdio.h> int string_length(char*); void reverse(char*); int main() { char string[100]; printf("Enter a string\n"); gets(string); reverse(string); printf("Reverse of entered string is \"%s\".\n", string); return 0; } void reverse(char *string) { int length, c; char *begin, *end, temp; length = string_length(string); begin = string; end = string; for ( c = 0 ; c < ( length - 1 ) ; c++ ) end++; for ( c = 0 ; c < length/2 ; c++ ) { temp = *end; *end = *begin; *begin = temp; begin++; end--; } } int string_length(char *pointer) { int c = 0; while( *(pointer+c) != '\0' ) c++; return c; }