Contents

  1. .
  2. ./arithmetic.c
  3. ./arrays.c
  4. ./datatypes.c
  5. ./ForFunzies.java
  6. ./hello.c
  7. ./index.html
  8. ./strings.c

. 1/8

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./arithmetic.c 2/8

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/* A review of the basic arithmetic operators in C. */

#include <stdio.h>

int main() {
    int x,y;
    int r1,r2,r3,r4,r5;
    double d1;
    
    x=4;
    y=7;
    r1=x+y;
    r2=x-y;
    r3=x/y;
    d1 = 1/2;
    r4=x*y;
    printf("r1 r2 r3 r4: %d %d %d %d\n",r1,r2,r3,r4);
    printf("d1: %f\n", r3, d1);
    r3++;
    r4--;
    r5=r4%r1;
    printf("r3 r4 r5: %d %d %d\n",r3,r4,r5);
    
    // WARNING: 
    // If your data is an integer and you format it as 
    // a float, chaos will ensue.
    printf("%f %f %f\n", 1 / 2, 1.0 / 2, 3.4/2);
}







./arrays.c 3/8

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#include <stdio.h>

main() {
        int a[3];
        int b[2];
        a[0] = 1;
        a[1] = -1;
        a[2] = 2;
        b[0] = 4;
        printf("%d %d %d\n", a[0], a[1], a[2]);
        printf("%d\n", a[3]);
        printf("%d\n", a[4]);
        printf("%d\n", a[5]);
}






./datatypes.c 4/8

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/* A review of the basic data types in C. */

#include <stdio.h>

int main() {
    int     x,y;
    char    a;
    float   f,e;
    double  d;
    
    x=4;
    y=7;
    a='H';
    f=-3.4;
    d=54.123456789;
    e=54.123456789;
    
    printf("%d %c %f %lf\n",x,a,e,d);
    printf("%d %c %.9f %.9lf\n",x,a,e,d);
}







./ForFunzies.java 5/8

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/**
 * Comparing how printf works in Java to how it works in C.
 */
public class ForFunzies {

    public static void main(String args[]) {
    
        /*
        Exception in thread "main" java.util.IllegalFormatConversionException: f != java.lang.Integer
        at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302)
        at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2806)
        at java.util.Formatter$FormatSpecifier.print(Formatter.java:2753)
        at java.util.Formatter.format(Formatter.java:2520)
        at java.io.PrintStream.format(PrintStream.java:970)
        at java.io.PrintStream.printf(PrintStream.java:871)
        at ForFunzies.main(ForFunzies.java:7)

        */
        // When the following is uncommented, you get the above error message.
        //System.out.printf("%f %f %f\n", 1 / 2, 1.0 / 2, 3.4/2);
        System.out.printf("%d %f %f\n", 1 / 2, 1.0 / 2, 3.4/2);

    }

}





./hello.c 6/8

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#include <stdio.h>

main() {
    printf("Hello World, and Goodbye!\n");
}






./index.html 7/8

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<html>
<head><title>Examples for /home/faculty/sprenkle/public_html/cs330/examples/03-c</title>
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/assignments/assign.css" />
</head>
<body>
<h1>Examples for /home/faculty/sprenkle/public_html/cs330/examples/03-c</h1>
<ul>
<li><a href=".//code.html">All IN ONE FILE (pretty syntax)</a>
<li><a href=".//ForFunzies.java">ForFunzies.java</a></li>
<li><a href=".//arithmetic.c">arithmetic.c</a></li>
<li><a href=".//arrays.c">arrays.c</a></li>
<li><a href=".//datatypes.c">datatypes.c</a></li>
<li><a href=".//hello.c">hello.c</a></li>
<li><a href=".//strings.c">strings.c</a></li>
</ul>
</body>






./strings.c 8/8

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/*
 * Removes the 'a's from a string
 */

#include <stdio.h>
#include <string.h>

main() {
	int i, j;
	char s[6];

	s[0] = 'a';
	s[1] = 'b';
	s[2] = 'a';
	s[3] = 'c';
	s[4] = 1;
	
	i = 0;
	j = 0;
	while (s[i] != 0) {
		if (s[i] != 'a') {
			s[j] = s[i];
			j++;
		}
		i++;
	}
	s[j] = 0;  // alternatively, s[j] = '\0'; character has value 0
	printf("%s\n", s);
}






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