Structures and unions

Earlier we have seen that how a variables can hold value and how arrays can hold a number of values of the same data type.These two data types can handle a great variety of situations. But quite often we deal with entities that are collection of dissimilar data types.There we use strcture.

Syntax :-

struct structName
{
datatye variableName1;
datatye variableName2;
.
.
.
.
datatye variableNamen;
}stuctVariable1,stuctVariable2,stuctVariable3;

Stucture Example :-

Lets enter informatin of 3 students and display them

struct student
{
char name[20];
char dept[20];
int m1,m2,m3;
float avg;
}s1,s2;

void main()
{
int total;
clrscr();
printf("\nEnter Information ");

printf("\nFirst Student: ");

printf("\nName: ");
scanf("%s",s1.name);
printf("\nDept: ");
scanf("%s",s1.dept);
printf("\nMarks in M1: ");
scanf("%d",&s1.m1);
printf("\nMarks in M2: ");
scanf("%d",&s1.m2);
printf("\nMarks in M3: ");
scanf("%d",&s1.m3);
total=s1.m1+s1.m2+s1.m3;
s1.avg=total/3;

printf("\nSecond Student: ");

printf("\nName: ");

scanf("%s",s2.name);
printf("\nDept: ");
scanf("%s",s2.dept);
printf("\nMarks in M1: ");
scanf("%d",&s2.m1);
printf("\nMarks in M2: ");
scanf("%d",&s2.m2);
printf("\nMarks in M3: ");
scanf("%d",&s2.m3);
s2.avg=(s2.m1+s2.m2+s2.m3)/3;

printf("\nDisplay Information ");

printf("\nFirst Student: ");
printf("\nName: ");
printf("%s",s1.name);
printf("\nDept: ");
printf("%s",s1.dept);
printf("\nMarks in M1: ");
printf("%d",s1.m1);
printf("\nMarks in M2: ");
printf("%d",s1.m2);
printf("\nMarks in M3: ");
printf("%d",s1.m3);
printf("\nAverage Marks : ");
printf("%f",s1.avg);

printf("\nSecond Student: ");

printf("\nName: ");
printf("%s",s2.name);
printf("\nDept: ");
printf("%s",s2.dept);
printf("\nMarks in M1: ");
printf("%d",s2.m1);
printf("\nMarks in M2: ");
printf("%d",s2.m2);
printf("\nMarks in M3: ");
printf("%d",s2.m3);
printf("\nAverage Marks : ");
printf("%f",s2.avg);
getch();
}

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