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//Datatype's program in C using char,int,float,double,pointer,array,structure,union #include<stdio.h> #include<conio.h> void primary(); void user(); void derived(); struct student { int d2; char s2[20]; }stu; union student1 { int d1; char s1[20]; }stu1; void main() { char ch; //clrscr(); while(1) { printf("\nDISPLAYING BASIC DATATYPE"); printf("\na.primary datatype\nb.derived datatype\nc.exit"); printf("\nenter your choice:"); scanf("%c",&ch); switch(ch) { case 'a':primary(); break; case 'b':derived();break; case 'c':exit(0); default:printf("\nwrong choice"); } } getch(); } void primary() { int i,ch; char c1; float f; double d; do { printf("\nPRIMARY DATATYPES\n1.integer\t2.float\t3.character\t4.double\t5.return to main"); printf("\nenter ur choice:"); scanf("%d",&ch); switch(ch) { case 1:printf("\nenter any integer"); scanf("%d",&i); printf("INTEGER: %d",i); break; case 2:printf("\nenter any float"); scanf("%f",&f); printf("FLOAT: %f",f); break; case 3:printf("\nenter any character"); fflush(stdin); scanf("%c",&c1); printf("CHAR: %c",c1); break; case 4:printf("\nenter any double value"); fflush(stdin); scanf("%lf",&d); printf("DOUBLE: %lf",d); } }while(ch<=4); } void derived() { int ch,a[10],i,n,a1,*p; p=&a1; do { printf("\nDERIVED DATATYPE\n1.array\t2.pointer\t3.structure\t4.union\t5.return to main"); printf("\nenter ur choice:"); scanf("%d",&ch); switch(ch) { case 1: printf("enter no.of integer elements"); scanf("%d",&n); printf("\nenter the elements"); for(i=0;i<n;i++) scanf("%d",&a[i]); printf("\nDISPLAYING ARRAY"); for(i=0;i<n;i++) { printf("\na[%d]=%d",i,a[i]); } break; case 2: printf("enter an integer"); scanf("%d",&(*p)); printf("\n*p=%d",(*p)); printf("\n&p=%u",p); break; case 3: printf("\nenter student rollno"); fflush(stdin); scanf(" %d",stu.d2); printf("\nenter student name:"); scanf("%s",stu.s2); printf("\nDISPLAYING STRUCTURE FROM PROGRAM"); printf("\nstruct student\nint d2: %d\nchar s2[20]: %s",stu.d2,stu.s2); break; case 4: printf("\nenter student rollno"); fflush(stdin); scanf(" %d",stu1.d1); printf("\nenter student name:"); scanf("%s",stu1.s1); printf("\nDISPLAYING UNION FROM PROGRAM"); printf("\nunion student1\nint d: %d\nchar a[20]: %s",stu1.d1,stu1.s1); break; } }while(ch<=4); }