1. Strings #include <stdio.h>
#include <stdlib.h> /* needed by atoi( ) and atof( ) */
#include <string.h> /* needed by str...( ) functions */

2. Copy One Array to Another
/* assign a to b */
strcpy( b, a );
printf( "%s\n", b );

3. Add One Array to Another
strcpy( b, a );
strcat ( b, " " );
strcat ( b, a );

4. Compare Strings
/* "Gary Burt" comes before "Mike Burt", so print a negative number */
printf( "%d\n", strcmp( a, c ) );
/* "Mike Burt" comes before "Gary Burt", so print a positive number */
printf( "%d\n", strcmp( c, a ) );
/* "Gary Burt" is the same as "Gary Burt", so print zero */
printf( "%d\n", strcmp( a, "Gary Burt" ) );

5. Getting Words From a String
/* get the first token (delimited by a blank) */
printf( "%s\n", strtok( b, " " ) );

6. Convert String to Numeric
/* convert a string to an integer */
printf( "%d\n", atoi( "1234" ) );
/* convert a string to a float */
printf( "%f\n", atof( " " ) );

7. Find Length Of A String
printf( "b is %d characters long\n", strlen( b ) );

8. Sample Program
#include <stdio.h>
#include <stdlib.h> /* needed by atoi( ) and atof( ) */
#include <string.h> /* needed by str...( ) functions */
int main( void ) {
char a[ 100 ] = "Gary Burt";
char b[ 100 ];
char c[ 100 ] = "Mike Burt";
/* Make sure the array a is as expected */
printf( "%s\n", a );

9. Sample Program
/* assign a to b */
strcpy( b, a );
printf( "%s\n", b );
/* put in a space and add the array a to what is in array a */
printf( "b is %d characters long\n", strlen( b ) );
strcat ( b, " " );
strcat ( b, a );

10. Sample Program
/* "Gary Burt" comes before "Mike Burt", so print a negative number */
printf( "%d\n", strcmp( a, c ) );
/* "Mike Burt" comes before "Gary Burt", so print a positive number */
printf( "%d\n", strcmp( c, a ) );
/* "Gary Burt" is the same as "Gary Burt", so print zero */
printf( "%d\n", strcmp( a, "Gary Burt" ) );
/* get the first token (delimited by a blank) */
printf( "%s\n", strtok( b, " " ) );

11. /* convert a string to an integer */ printf( "%d\n", atoi( "1234" ) );
Sample Program
/* convert a string to an integer */
printf( "%d\n", atoi( "1234" ) );
/* convert a string to a float */
printf( "%f\n", atof( " " ) );
return 0; }

12. Output Gary Burt b is 9 characters long b is 10 characters long
Gary Burt Gary Burt -1 1
Gary
1234