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Program to calculate area of different shape in C using switch statement #include<stdio.h> void main () { int choice,r,l,b,base,h,area1,area2,area3; clrscr(); printf ("\n you can perform following operation:"); printf ("\n 1. Area of circle:"); printf ("\n 2. Area of rectangle:"); printf ("\n 3. Area of parallelogram;"); printf ("\n Enter your choice:"); scanf ("%d", &choice); switch ( choice ) { case 1: printf ("\n Enter value of radius:"); scanf ("%d", &r); area1 = 3.14*(r*r); printf ("%d", area1); break; case 2: printf ("\n Enter value of length:"); scanf ("%d", &l); printf ("\n Enter value of breadth:"); scanf ("%d", &b); area2 = l*...