Contents

  1. .
  2. ./arithmetic.c
  3. ./arrays.c
  4. ./charbychar.c
  5. ./datatypes_and_print.c
  6. ./index.html
  7. ./strcmp_example.c
  8. ./string.c
  9. ./strlen_example.c

. 1/9

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./arithmetic.c 2/9

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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;

	x = 4;
	y = 7;
	r1 = x + y;
	r2 = x - y;
	r3 = x / y;
	r4 = x * y;
	printf("%d %d %d %d\n", r1, r2, r3, r4);

	r3++;
	r4--;
	r5 = r4 % r1;
	printf("%d %d %d\n", r3, r4, r5);
}






./arrays.c 3/9

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/* A review of arrays in C.  */

#include <stdio.h>

int 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[4]);
	
	printf("%d\n", b[1]);
}






./charbychar.c 4/9

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/* What does this code do? */

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

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

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






./datatypes_and_print.c 5/9

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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 %.3lf\n", x, a, e, d);
}






./index.html 6/9

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<html>
<head><title>Examples for /home/faculty/sprenkle/public_html/cs330/examples/02-c</title>
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/css/themes/spacelab.min.css" />
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/css/course.css" />
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/css/syntax.css" />
<link rel="stylesheet" type="text/css" href="http://www.cs.wlu.edu/~sprenkle/cs330/css/style.css" />
</head>
<body>
<h1>Examples for /home/faculty/sprenkle/public_html/cs330/examples/02-c</h1>
<ul>
<li><a href=".//code.html">All IN ONE FILE (pretty syntax)</a>
<li><a href=".//arithmetic.c">arithmetic.c</a></li>
<li><a href=".//arrays.c">arrays.c</a></li>
<li><a href=".//charbychar.c">charbychar.c</a></li>
<li><a href=".//datatypes_and_print.c">datatypes_and_print.c</a></li>
<li><a href=".//strcmp_example.c">strcmp_example.c</a></li>
<li><a href=".//string.c">string.c</a></li>
<li><a href=".//strlen_example.c">strlen_example.c</a></li>
</ul>
</body>






./strcmp_example.c 7/9

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

int main()
{
    char str1[] = "abcd";
    char str2[] = "abCd";
    char str3[] = "abcd";
    int result;

    // comparing strings str1 and str2
    result = strcmp(str1, str2);
    printf("strcmp(str1, str2) = %d\n", result);
    printf("!strcmp(str1, str2) = %d\n", !result);


    // comparing strings str1 and str3
    result = strcmp(str1, str3);
    printf("strcmp(str1, str3) = %d\n", result);
    printf("!strcmp(str1, str3) = %d\n", !result);


    return 0;
}





./string.c 8/9

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/* A close look at a character array.
   Run program multiple times, after running different programs.
*/

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

int main() {
	char s[6];
	int i;
	
	printf("in the beginning, s is %s\n", s);
	
	/* stresses the importance of making the end of the string explicit.
	What does the data in the array look like to start? */
	for( i = 0; i < 6; i++ ) {
	    printf("%c\n", s[i]);
	}

	s[0] = 'a';
	s[1] = 'b';
	
	printf("at the end, s is %s\n", s);
	
}






./strlen_example.c 9/9

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#include <stdio.h>
#include <string.h>
int main() {
    char a[20]="Program";
    char b[20]={'P','r','o','g','r','a','m','\0'};
    char c[20];
    int i;

    printf("Enter a string: ");
    fgets(c, 20, stdin);

    printf("Length of string a = %d \n", strlen(a));

    //calculates the length of string before null charcter.
    printf("Length of string b = %d \n", strlen(b));
    
    // why is the length one longer than you'd expect?
    printf("Length of string c = %d \n", strlen(c));
    
    i=0;
    while( c[i] != '\0' ) {
        printf("%i: %c\n", i, c[i]);   
        i++;
    }

    return 0;
}




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