// CSE 374 18sp Lecture 9
// Asks the user to input a string and an integer and echos the string
// the requested number of times.
// Demonstrates using the preprocessor (includes, defines), strings,
// pointers, loops, and printf/scanf, as well as standard C file structure.

// includes for functions & types defined in the standard libraries
#include <stdio.h>
#include <stdlib.h>

// symbolic constants
#define MAX_ECHO_LENGTH 20

// global variables (if any)
char prompt[] = "please enter a string and an integer\n";

// function prototypes (if not in a header file, to handle “declare before use”)
int getInputs(int *numRepeatsPtr, char *str);
void printRepeats(int numRepeats, char* str);

// function definitions
int main(int argc, char **argv) {
  int numRepeats;
  char str[MAX_ECHO_LENGTH + 1];  // Plus one for the null terminating character

  if (!getInputs(&numRepeats, str)) {
    return EXIT_FAILURE;  // Defined in stdlib.h
  }

  printRepeats(numRepeats, str);
  return EXIT_SUCCESS;  // Defined in stdlib.h
}

int getInputs(int *numRepeatsPtr, char *str) {
  int numInputs = 0;
  printf(prompt);
  while (numInputs < 2) {
    numInputs = scanf("%20s %d", str, numRepeatsPtr);
    if (numInputs < 2) {
      printf("bad input, needs string and integer\n");
      numInputs = 0;
    }
  }
  if (!*numRepeatsPtr) {
    printf("cannot echo 0 times\n");
    return 0;
  }
  return 1;
}

void printRepeats(int numRepeats, char* str) {
  for (int i = 0; i < numRepeats; i++) {
    printf("%s\n", str);
  }
}