C Programming. Charudatt Kadolkar. IIT Guwahati. C Programming p.1/34
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1 C Programming Charudatt Kadolkar IIT Guwahati C Programming p.1/34
2 We want to print a table of sine function. The output should look like: C Programming p.2/34
3 main() int float degrees; radians; degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.3/34
4 return statement return statement returns the control to operating system, or in other words, terminates the program C Programming p.4/34
5 While Loop Syntax for while loop is while ( condition ) statement1; or while ( condition ) statement1; statement2; : : C Programming p.5/34
6 main() int degrees; degrees :? float radians; radians :? degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.6/34
7 main() int degrees; degrees : 0 float radians; radians :? degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.7/34
8 main() int degrees; degrees : 0 float radians; radians :? degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.8/34
9 main() int degrees; degrees : 0 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.9/34
10 main() int degrees; degrees : 0 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.10/34
11 main() int degrees; degrees : 20 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.11/34
12 main() int degrees; degrees : 20 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.12/34
13 main() int degrees; degrees : 20 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.13/34
14 main() int degrees; degrees : 20 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.14/34
15 main() int degrees; degrees : 40 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.15/34
16 main() int degrees; degrees : 180 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.16/34
17 main() int degrees; degrees : 180 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.17/34
18 main() int degrees; degrees : 180 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.18/34
19 main() int degrees; degrees : 180 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.19/34
20 main() int degrees; degrees : 200 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.20/34
21 main() int degrees; degrees : 200 float radians; radians : degrees = 0; while ( degrees <= 180 ) radians = degrees * / 180.0; printf("%3d %8.4f\n",degrees,sin(radians) ); degrees = degrees + 20; C Programming p.21/34
22 Formatting the Output degrees = 1234; printf("%d\n",degrees); 1234 printf("%3d\n",degrees); 1234 printf("%4d\n",degrees); 1234 printf("%5d\n",degrees); 1234 printf("%6d\n",degrees); 1234 radians = printf("%f\n",radians); printf("%4.4f\n",radians); printf("%6.4f\n",radians); printf("%8.4f\n",radians); printf("%10.4f\n",radians); C Programming p.22/34
23 Integer Sum For a positive integer n, let s = n + (n 1) We want to write a program which calculates this sum. C Programming p.23/34
24 Integer Sum main() int sum; int i; int n; scanf("%d" &n); sum = 0; i = 1; while ( i <= n ) sum = sum + i; i = i + 1; printf("sum of first %d integers = %d\n",n,sum); C Programming p.24/34
25 Factorial Function For a positive integer n, n! = n (n 1) 2 1 We want to write a program which calculates factorial of n. C Programming p.25/34
26 Factorial Functions main() int factorial; int i; int n; scanf("%d" &n); factorial = i = 1; while ( i <= n ) factorial = factorial * i; i = i + 1; printf("factorial of %d = %d\n",n,factorial); C Programming p.26/34
27 Average Heights A class has n students. We want a program that reads the heights in cms and prints the average. C Programming p.27/34
28 Integer Sum main() int sum; int i; int n; int height; scanf("%d" &n); sum = 0; i = 1; while ( i <= n ) scanf("%d", &height); sum = sum + height; i = i + 1; printf("average Height = %d\n",n,sum/n); C Programming p.28/34
29 Exponential Function For any x R, e x = 1 + x + x2 2! + + xn n! + R n(x) where R n (x) = x n+1 e ξ /(n + 1)! for some 0 < c < x. If x is sufficiently small, we can approximate exponential function by a polynomial of degree n. We can do this in two ways. 1. Add first n terms of the series, for a given n. 2. Add first n terms of the series, such that R n (x) < ɛ for some given ɛ > 0. Also, R n (x) < ex n+1 /(n + 1)! if 0 < x < 1. C Programming p.29/34
30 Exponential Function float x, ex, t; int i, n; scanf("%d", scanf("%f", &n); &x); ex = 1; t = 1; i = 1; while ( i <= n ) t = t * x / i; ex = ex + t; i = i + 1; printf("exp(%f) = %f\n", x, ex); C Programming p.30/34
31 Exponential Function float x, ex, t, eps; int i; scanf("%f", scanf("%f", &eps); &x); ex = 1; t = 1; i = 1; while ( 1 > 0 ) t = t * x / i; if ( * t < eps ) break; ex = ex + t; i = i + 1; printf("exp(%f) = %f\n", x, ex); C Programming p.31/34
32 Arrays Array is a regular arrangement of objects. In C programming, int marks[10]; declaration, creates 10 int type variables, puts them in adjacent memories, and calls this array of variables by name marks. These are numbered from 0 to 9. We can access the 6 th memory location of marks array by typing marks[5]. marks[5] = 96; marks[7] = 27; total = marks[5] + marks[7]; We can enclose any integer expression i = 5; marks[i] = 96; marks[i+2] = 27; C Programming p.32/34
33 Arrays If x = (x 1, x 2, x 3 ) and y = (y 1, y 2, y 3 ) are two vectors in 3D, the angle between these is given by x «y cos 1 x y C Programming p.33/34
34 Angle between vectors float x[3]; float y[3]; float sx, sy, sxy; int i; scanf("%f%f%f", &x[0], &x[1], &x[2]); scanf("%f%f%f", &y[0], &y[1], &y[2]); sx = 0; sy = 0; sxy = 0; i = 0; while ( i < 3 ) sx = sx + x[i]*x[i]; sy = sy + y[i]*y[i]; sxy = sxy + x[i]*y[i]; angle = sxy / sqrt(sx*sy); C Programming p.34/34
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