Question

C Programming question:

Develop a program named “sample” that prints the value of two functions:
1. Function f1 takes a single input argument of type int and returns the value of its input argument as float
2. Function f2 takes a single input argument of type char and returns an int. The output of f2 is the result of the sum of the values of the global variables, and the input
argument minus the value of char ‘a’ plus the value of char ‘A’

Structural Requirements:
1. Your executable must be named sample (your makefile must ensure this)
2. Your program should not take any arguments
3. Your solution must have at least two C source files (e.g., a main and file1.c), two header files (e.g., globals.h, and externs.h), and a makefile
4. Your program should define two global variables (e.g., p and q), both of type int, one with value 11 and the second with a value of 32
5. Your main should have two local variables: int i = 5; char c = ‘x’
6. Main should invoke f1 with the sum of i, p, and q as input, and pass the value of c to f2

Answer 1

IDE Used: Dev C++

Required Files are given below

main.c

#include <stdio.h>
#include <stdlib.h>
#include "globals.h" //for using function f1 and f2
#include "externs.h" //for using global variables p and q   

{
   int i =5;
   char c='x';
  
   //sum of i+p+q
   i=i+p+q;
  
   //calling function f1
   printf("\nResult of function f1: %0.2f",f1(i));
  
   //calling of function f2
   printf("\nResult of function f2: %d",f2(c));
   return 0;
}

file.c

#include <stdio.h>
#include <stdlib.h>
#include "globals.h" //to use global variables p and q

extern int p=11;
extern int q=32;

//defination of function f1
float f1(int i)
{
   return (float)i;
}

//defination of function f2
int f2(char c)
{
   return (int)c+p+q-'a'+'A';
}

externs.h

#ifndef file1
#define file1

//declaration of function f1 and f2
float f1(int);
int f2(char);

#endif

globals.h

#ifndef globalVar

//declaration of global variales
int p;
int q;

#endif

Makefile.win

# Project: sample
# Makefile created by Dev-C++ 5.11

CPP = g++.exe
CC = gcc.exe
WINDRES = windres.exe
OBJ = main.o file1.o
LINKOBJ = main.o file1.o
LIBS = -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib" -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/lib" -static-libgcc
INCS = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include"
CXXINCS = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include/c++"
BIN = sample.exe
CXXFLAGS = $(CXXINCS)
CFLAGS = $(INCS)
RM = rm.exe -f

.PHONY: all all-before all-after clean clean-custom

all: all-before $(BIN) all-after

clean: clean-custom
   ${RM} $(OBJ) $(BIN)

$(BIN): $(OBJ)
   $(CC) $(LINKOBJ) -o $(BIN) $(LIBS)

main.o: main.c
   $(CC) -c main.c -o main.o $(CFLAGS)

file1.o: file1.c
   $(CC) -c file1.c -o file1.o $(CFLAGS)

Output