Lecture 12 Speak Shout Code

/*
 * speak.h - interface to module to write messages to stdout
 */

#ifndef SPEAK_H_
#define SPEAK_H_

/* Write message m to stdout followed by a newline */
void speak(char m[]);

#endif  // SPEAK_H_

/*
 * speak.c - implementation of module to write messages to stdout
 */

#include <stdio.h>
#include "speak.h"

/* Write message m to stdout followed by a newline */
void speak(char m[]) {
  printf("%s\n", m);
}

/*
 * shout.h - interface to module to write messages to stdout loudly
 */

#ifndef SHOUT_H_
#define SHOUT_H_

/* Write message m in uppercase to stdout followed by a newline */
void shout(char m[]);

#endif  // SHOUT_H_

/*
 * shout.c - implementation of module to write messages to stdout loudly
 */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "speak.h"
#include "shout.h"

/* Write message m in uppercase to stdout followed by a newline */
void shout(char m[]) {
  int len;      /* message length */
  char* mcopy;  /* copy of original message */
  int i;

  len = strlen(m);
  mcopy = (char*)malloc(len*sizeof(char)+1);
  strcpy(mcopy, m);
  for (i = 0; i < len; i++)
    mcopy[i] = toupper(mcopy[i]);
  speak(mcopy);
  free(mcopy);
}

/*
 * main.c - demo/test program for speak and shout functions
 */

#include "speak.h"
#include "shout.h"

/* Say HELLO and goodbye */
int main(int argc, char* argv[]) {
  shout("hello");
  speak("goodbye");
  return 0;
}

# Very simple Makefile for talk/speak/shout program

CC = gcc
CFLAGS = -Wall -g -std=c11

# default target
all: talk

talk: main.o speak.o shout.o
    $(CC) $(CFLAGS) -o talk main.o speak.o shout.o

# individual source files
speak.o: speak.c speak.h
    $(CC) $(CFLAGS) -c speak.c

shout.o: shout.c shout.h speak.h
    $(CC) $(CFLAGS) -c shout.c

main.o: main.c speak.h shout.h
    $(CC) $(CFLAGS) -c main.c

# a "phony" target to remove built files and backups
clean:
    rm -rf talk *.o *~