Merge pull request #7 from 112121040/if-else-coding

If else coding

Author: singhofen

alternative method to switch using if else

@@ -0,0 +1,41 @@
+#include<stdio.h>
+#include<stdlib.h>
+//main function
+int main() 
+{
+//Variable Decleration
+int choice;
+float r ,circle,side,square;
+while(choice != 3)
+{
+printf("Press 1 for area of circle\n");
+printf("Press 2 for area of square\n");
+printf("Press 3 to CY@\n");
+scanf("%d", &choice);
+
+if(choice==1) 
+{
+printf("Enter the radius.\n\n");
+scanf("%f", &r);
+circle = 3.14*r*r;
+printf("Area of circle is %f\n", circle);
+}
+else if(choice==2)
+{
+	printf("Enter a side.\n");
+scanf("%f", &side);
+square = side*side;
+printf("Area of square is %f\n", square);
+}
+ else if(choice==3)
+ {
+ printf("=======================\n=======================\n=======================\n");
+ }
+else
+{
+printf("you entered incorrect choice.\n");
+ }
+
+}
+
+}

differentiation prog

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <conio.h>
+
+float poly(float a[], int, float);
+
+int main()
+{
+ float x, a[10], y1;
+ int d, i;
+
+ printf("Enter polynomial equation degree: ");
+ scanf("%d", &d);
+
+ printf("Enter x value for which the equation is to be evaluated: ");
+ scanf("%f", &x);
+
+ for (i = 0; i <= d; i++) {
+ printf("Enter x coeff to the power %d: ", i);
+ scanf("%f", &a[i]);
+ }
+
+ y1 = poly(a, d, x);
+
+ printf(" value of polynomial equation for the value of x = %.2f is: %.2f", x, y1);
+
+ return 0;
+}
+
+float poly(float a[], int d, float x)
+{
+ float p;
+ int i;
+
+ p = a[d];
+
+ for (i = d; i >= 1; i--) {
+ p = (a[i - 1] + x * p);
+ }
+
+ return p;
+}