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There are about 45 operators available in C. Surprisingly there is no operator for exponentiation... a slip, which can be forgiven considering the fact that C has been developed by an individual, not by a committee. − Once the value of si is calculated it needs to be displayed on the screen. Unlike other languages, C does not contain any instruction to display output on the screen. All output to screen is achieved using readymade library functions. One such 18 Let Us C function is printf( ). We have used it display on the screen the value contained in si.

Chapter 1: Getting Started 27 Though Arithmetic instructions look simple to use one often commits mistakes in writing them. Let us take a closer look at these statements. Note the following points carefully. (a) C allows only one variable on left-hand side of =. That is, z = k * l is legal, whereas k * l = z is illegal. (b) In addition to the division operator C also provides a modular division operator. This operator returns the remainder on dividing one integer with another. Thus the expression 10 / 2 yields 5, whereas, 10 % 2 yields 0.

We would discuss functions and their working in great detail in Chapter 5. − Any variable used in the program must be declared before using it. 5 ; − In the statement, si = p * n * r / 100 ; * and / are the arithmetic operators. The arithmetic operators available in C are +, -, * and /. C is very rich in operators. There are about 45 operators available in C. Surprisingly there is no operator for exponentiation... a slip, which can be forgiven considering the fact that C has been developed by an individual, not by a committee.

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