Solution for chapter 2.

Exercise_2/2.10_Sol.c

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+#include<stdio.h>
+#include<math.h>
+#define PIE 3.14//Symbolic constant.
+
+void main()
+{
+	double r = 4,a,p;
+	a = PIE * r * r;
+	p = 2 * PIE * r;
+	printf("The area of the circle with radius = 4 is %0.2lf and perimeter is %0.2lf\n",a,p);
+}

Exercise_2/2.1_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	float prod=0,i,n;
+	printf("Enter n: ");
+	scanf("%f",&n);
+	for(i=1;i<=n;i=i+1)
+	{
+		prod = prod + (1/i);
+	}
+	printf("The sum of series 1 + 1/2 + 1/3 +....+ 1/n is: %0.2f",prod);
+}

Exercise_2/2.2_Sol.c

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+#include<math.h>
+#include <stdio.h>
+
+void main()
+{
+	double p,r;
+	printf("Enter r: ");
+	scanf("%lf",&r);
+	printf("You entered %0.2lf paise",(r*100));
+}

Exercise_2/2.3_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	int i;
+	for(i=2;i<101;i=i+2)
+	{
+		printf("%d ",i);	
+	}
+}

Exercise_2/2.4_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	float x,y;
+	printf("Enter x and y ");
+	scanf("%f%f",&x,&y);
+	if(y == 0)
+		printf("Division not possible.\n");
+	else
+		printf("Division is %f\n",(x/y));
+}

Exercise_2/2.5_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	float pr,ps;
+	printf("Enter the prices of rice and sugar: ");
+	scanf("%f%f",&pr,&ps);
+	printf("Item     Price\n");
+	printf("Rice     Rs.%0.2f\n",pr);
+	printf("Sugar    Rs.%0.2f\n",ps);
+}
+

Exercise_2/2.6_Sol.c

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+#include<stdio.h>
+
+void main()
+{
+	int a[10],i=0,n,po=0,ne=0;
+	printf("Enter numbers. Enter 0 to stop.");
+	while(1)
+	{
+		scanf("%d",&a[i]);
+		if(a[i] == 0)
+			break;
+		else
+			i++;
+	}
+	n = i;
+	for(i=0;i<n;i++)
+	{
+		if(a[i]>0)
+			po++;
+		else
+			ne++;
+	}
+	printf("You entered %d positive and %d negative numbers\n",po,ne);
+}

Exercise_2/2.7_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	int x,y;
+	short z;
+	x = 343534;
+	y = 283729;
+	z = x+y;
+	printf("The values of x, y and z are: %d %d %i\n",x,y,z);
+	printf("Size of an integer is 16bits and for short is 8 bits.");
+}

Exercise_2/2.8_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	float x,y;
+	int z;
+	printf("Enter values of x and y: ");
+	scanf("%f%f",&x,&y);
+	z = x+y;
+	printf("The values of x, y and z are: %f %f %d\n",x,y,z);
+}

Exercise_2/2.9_Sol.c

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+#include <stdio.h>
+
+void main()
+{
+	typedef int num;
+	num n1=4,n2=6;
+	printf("Numbers are %d %d",n1,n2);
+}