Homework Assignment 1
Homework Assignment 1
Here are my solutions to homework 1. Please let me know if you find an error!
Problem 3.3 in Austin/Chancogne.
/*
* ==========================================================
* prog_sphere.c : Compute volume of a sphere
*
* Written By: Mark Austin October 1996
* ==========================================================
*/
#include <stdio.h> /* Standard Input/Output function declarations */
#include <math.h> /* Math functions, such as sqrt(x). */
int main( void ) {
float fRadius; /* Radius of sphere */
float fVolume; /* Volume of sphere */
/* [a] : Prompt User for radius of sphere */
printf("Please Enter radius of sphere : ");
scanf("%f%*c", &fRadius );
/* [b] : Compute and print volume of sphere */
printf("Radius of sphere = %f\n", fRadius);
fVolume = 4.0/3.0*M_PI*pow(fRadius, 3.0);
printf("Volume of sphere = %f\n", fVolume);
}
Problem 3.5 in Austin/Chancogne.
/*
* ===========================================================
* prog_triangle.c : Compute Area of Triangle
*
* -- Side lengths of triangle are read in from Keyboard
* -- Area of triangle is printed to screen
*
* Written By: Mark Austin October 1996
* ===========================================================
*/
#include <stdio.h> /* Standard Input/Output function declaration */
#include <math.h> /* Mathematical function declaration */
#include <stdlib.h> /* For declaration of exit() function */
#define min(a, b) (((a) < (b)) ? (a) : (b))
#define min3(a, b, c) min(min(a, b), c)
#define max(a, b) (((a) > (b)) ? (a) : (b))
#define max3(a, b, c) max(max(a, b), c)
int main(void) {
float fA, fB, fC; /* Side lengths A, B, C of triangle */
float fS; /* S = (A + B + C)/2 */
float fLongest, fShortest; /* longest and shortest side lengths */
float fMiddle; /* Middle side length */
float fArea; /* Computed Area of Triangle */
/* [a] : print program heading */
printf("Compute Area of Triangle with Predefined Side Lengths\n");
printf("=====================================================\n");
/* [b] : Prompt user for side lengths of triangle */
printf("Input Side Lengths of Triangle\n");
printf("Enter Side a : ");
scanf("%f%*c", &fA);
printf("Enter Side b : ");
scanf("%f%*c", &fB);
printf("Enter Side c : ");
scanf("%f%*c", &fC);
/* [c] : Print side lengths of the triangle */
printf( "Side Lengths are : %12.5g, %12.5g, %12.5g\n", fA, fB, fC );
/* [d] : If any of the side lengths is less than or equal to zero, exit */
if (fA <= 0.0 || fB <= 0.0 || fC <= 0.0) {
printf("Cannot Compute Area - Lengths of triangle sides must all be \n");
printf(" greater than zero. \n");
exit(1);
}
/* [e] : If sum of shorter two sides is less than longest side, exit */
fLongest = max3(fA, fB, fC);
fShortest = min3(fA, fB, fC);
fMiddle = (fA + fB + fC) - (fLongest + fShortest);
if (( fShortest + fMiddle ) <= fLongest ) {
printf("Cannot Compute Area - Sum of shorter two sides is less than\n");
printf(" or equal to the longest side. \n");
exit(1);
}
/* [f] : Compute and print area of triangle */
fS = (fA + fB + fC)/2.0;
fArea = sqrt(fS*(fS-fA)*(fS-fB)*(fS-fC));
printf("Computed Area of Triangle = %12.5g\n", fArea);
}
Problem 4.6 in Austin/Chancogne.
/*
* =========================================================
* prog_limits.c -- Show limits of various variable types.
*
* Written By: Mark Austin October 1996
* =========================================================
*/
#include <limits.h>
#include <float.h>
#include <stdio.h>
int main( void ) {
/* [a] : print heading for output */
printf("================================================================= \n");
printf("TYPE BYTES BITS Minimum Maximum \n");
printf("================================================================= \n");
/* [b] : signed and unsigned characters */
printf("char (signed) ");
printf("%4d", sizeof (char));
printf("%8d", CHAR_BIT*sizeof (char));
printf("%17i", SCHAR_MIN );
printf("%17i\n", SCHAR_MAX );
printf("char (unsigned) ");
printf("%4d", sizeof (unsigned char));
printf("%8d", CHAR_BIT*sizeof (unsigned char));
printf("%17i", 0 );
printf("%17i\n", UCHAR_MAX );
/* [c] : signed, unsigned, long and short integers */
printf("int (signed) ");
printf("%4d", sizeof (int));
printf("%8d", CHAR_BIT*sizeof (int));
printf("%17i", INT_MIN );
printf("%17i\n", INT_MAX );
printf("int (unsigned) ");
printf("%4d", sizeof (unsigned int));
printf("%8d", CHAR_BIT*sizeof (unsigned int));
printf("%17i", 0 );
printf("%17u\n", UINT_MAX );
printf("int (long) ");
printf("%4d", sizeof (long int));
printf("%8d", CHAR_BIT*sizeof (long int));
printf("%17i", LONG_MIN );
printf("%17i\n", LONG_MAX );
printf("int (unsigned long)");
printf("%4d", sizeof (unsigned long int));
printf("%8d", CHAR_BIT*sizeof (unsigned long int));
printf("%17i", 0 );
printf("%17u\n", ULONG_MAX );
/* [d] : floating point numbers */
printf("\n");
printf("float ");
printf("%4d", sizeof (float));
printf("%8d", CHAR_BIT*sizeof (float));
printf("%17g", FLT_MIN );
printf("%17g\n", FLT_MAX );
printf("double ");
printf("%4d", sizeof (double));
printf("%8d", CHAR_BIT*sizeof (double));
printf("%17g", DBL_MIN );
printf("%17g\n", DBL_MAX );
printf("double (long) ");
printf("%4d", sizeof (long double));
printf("%8d", CHAR_BIT*sizeof (long double));
printf("%17Lg", LDBL_MIN );
printf("%17Lg\n", LDBL_MAX );
}
The output generated by this program on a DECSTATION 5000 is as follows:
=================================================================
TYPE BYTES BITS Minimum Maximum
=================================================================
char (signed) 1 8 -128 127
char (unsigned) 1 8 0 255
int (signed) 4 32 -2147483648 2147483647
int (unsigned) 4 32 0 4294967295
int (long) 4 32 -2147483648 2147483647
int (unsigned long) 4 32 0 4294967295
float 4 32 1.17549e-38 3.40282e+38
double 8 64 2.22507e-308 1.79769e+308
double (long) 16 128 3.3621e-4932 1.18973e+4932
Program output on other hardware platforms may be different.
Developed in February 2000 by Mark Austin
Copyright © 2000, Departments of Civil and Mechanical Engineering, University of Maryland