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This program prints the square roots of the numbers 0 through 5. Each time the expression sqr t ( i > is evaluated in the for loop, the sqr t function is executed. Its actual code is hidden away within the Standard C Library. In using it, we may confidently assume that the expression sqrt ( i ) will be replaced by the actual square root of whatever value i has at that moment. Notice the directive # inc lude <math . h> on the second line. This is necessary for the compiler to find the definition of the sqr t function. It tells the compiler that the function is declared in the <math. h> header file.
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A function like sqr t ( ) is executed by using its name as a variable in a statement, like this:
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y = sqrt(x);
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This is called invoking or calling the function. Thus in Example 4.1, the code sqrt ( i ) caZZs the sqrt function. The expression i in the parentheses is called the argument or actual parameter of the function call, and we say that it is passed by vaZue to the function. So when i is 3, the value 3 is passed to the sqr t function by the call sqr t ( i ) . This process is illustrated by the following diagram:
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1.73205 /
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The variable i is declared in main ( ) . During the fourth iteration of the for loop, its value is 3. That value is passed to the sqrt ( ) function which then returns the value 1.73205.
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EXAMPLE 4.2 Testing an Identity from Trigonometry
Here is another program that uses the <math . h> header file. Its purpose is to allow an empirical verification of the standard trigonometric identity sir-h = 2 sinxcosx :
#include <iostream.h> #include <math.h> // Program to test trigonometric identity sin 2x = 2 sin x cos x: main0 for (float x = 0; x < 2; x += 0.2) tout << "\t" << x << "\t\t" << sin(2*x) cc 2*sin(x)*cos(x) C-C endl;
0 O-0
<< "\t"
0*389418
0.9 32039 . -. o-6 oi ,0.999574 1 0.909297 f*2 O,Q754G3 1.4 0 t J34988 I..6 . . -0Jl583744 1.8 -0.442521
0*389428 0.717356 0.932039, 0 * 999574 0,909297 0.675463 01334988 -0,0583744 -0.442521
. . .:. . ..j . ..
The program prints x in the first column, sin 2x in the second column, and 2 sin x cos x in the third column. For each value of x tested, sin 2x = 2 sin x cos X. Of course, this does not prove the identity. It merely provides convincing empirical evidence of its truth.
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FUNCTIONS
Function values may be used like ordinary variables in an expression. Thus we can write
y = sqrt(2); tout << 2*sin(x)*cos(x);
We can even nest function calls, like this: Y = sqrt(1 + 2*sqrt(3 + 4*sqrt(5))) Most of the mathematical functions that you find on a pocket calculator are declared in the <math . h> header file, including all those shown in Table 4.1. Table 4.1 Some <math. h> Functions Function
aces(x) asin atan ceil(x) cos (x) exp (x> fabs(x) floor(x) log (x> loglO POWkP) sin(x) sqrt (x> tan(x)
Description
inverse cosine of x (in radians) inverse sine of x (in radians) inverse tangent of x (in radians) ceiling of x (rounds up) cosine of x (in radians) exponential of x (base e) absolute value of x floor of x (rounds down) natural logarithm of x (base e) common logarithm of x (base 10) x to the power p sine of x (in radians) square root of x tangent of x (in radians)
Example
acos(0.2) returns 1.36944 asin(0.2) returns 0.201358 atan(0.2) returns 0.197396 ceil(3.141593) returns
cos (2) returns -0.416147 exp(2) returns 7.38906 fabs (-2) returns 2.0 floor(3.141593) returns 3.0 log(2) returns 0.693147 loglO(2) pow(2,3) returns 0.30103 returns 8.0
sin(2) returns 0.909297 sqrt(2) returns 1.41421 tan(2) returns -2.18504
Notice that every mathematical function returns a double type. If it is passed an integer, the int is promoted to a double before it is processed by the function. Table 4.2 lists some of the more useful header files in the Standard C Library. Table 4.2 Some of the Header Files in the Standard C Library Header File
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