Defining, declaring and using structures
The code
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/**************************************
** File: struct1.c
** Author: Dennis L. Frey
** Date: 1/20/00
** Section: N/A
** E-mail: frey@cs.umbc.edu
**
** Defining, declaring and using
** structures and typedefs
*****************************************/
#include <stdio.h>
#define SIZE 25
/* Structure definition */
typedef struct student
{
char name[SIZE] ;
char major[SIZE] ;
double gpa ;
} STUDENT;
int main()
{
STUDENT student1, student2, temp ;
/* input data for student1 */
printf ("Input student name: ");
scanf ("%s", student1.name);
printf ("Input student major: ");
scanf ("%s", student1.major);
printf ("Input student gpa: ");
scanf ("%lf", &student1.gpa);
/* input data for student2 */
printf ("Input student name: ");
scanf ("%s", student2.name);
printf ("Input student major: ");
scanf ("%s", student2.major);
printf ("Input student gpa: ");
scanf ("%lf", &student2.gpa);
printf("\n\n");
/* print student1 data */
printf ("student1 name = %s\n", student1.name);
printf ("student1 major = %s\n", student1.major);
printf ("student1 gpa = %5.2f\n", student1.gpa);
/* print student 2 data */
printf ("student2 name = %s\n", student2.name);
printf ("student2 major = %s\n", student2.major);
printf ("student2 gpa = %5.2f\n", student2.gpa);
/* Swap records using assignment */
temp = student1 ;
student1 = student2 ;
student2 = temp ;
/* print student1 data */
printf ("student1 name = %s\n", student1.name);
printf ("student1 major = %s\n", student1.major);
printf ("student1 gpa = %5.2f\n", student1.gpa);
/* print student2 data */
printf ("student2 name = %s\n", student2.name);
printf ("student2 major = %s\n", student2.major);
printf ("student2 gpa = %5.2f\n", student2.gpa);
return 0;
}
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The data file
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linux1[102] % cat data
Roadrunner
Engineering
3.8
Coyote
Engineering
1.2
]]>
The output
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linux1[103] % a.out < data
Input student name: Input student major: Input student gpa: Input
student name: Input student major: Input student gpa:
student1 name = Roadrunner
student1 major = Engineering
student1 gpa = 3.80
student2 name = Coyote
student2 major = Engineering
student2 gpa = 1.20
student1 name = Coyote
student1 major = Engineering
student1 gpa = 1.20
student2 name = Roadrunner
student2 major = Engineering
student2 gpa = 3.80
linux1[104] %
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