floating point constant in c
- 1. NAME: RAHUL SAMANTA DEPARTMENT: ELECTRICAL ENGINEERING SEMESTER: 2nd YEAR: 1st SUBJECT: COMPUTER SCIENCE (CS-201) TOPIC: FLOATING POINT CONSTANT
- 2. FLOATING POINT CONSTANT IN C LANGUAGE IT IS A PART OF NUMERIC CONSTANT. IT IS ALSO KNOWN AS REAL CONSTANT.
- 4. DESCRIPTION OF FLOATINT POINT CONSTANT A "floating-point constant" is a decimal number that represents a signed real number. The representation of a signed real number includes an integer portion, a fractional portion, and an exponent. We use floating-point constants to represent floating-point values that cannot be changed.
- 5. A floating-point constant consists of: •Decimal integer •Decimal point •Decimal fraction •e or E and a signed integer exponent (optional) •Type suffix: f or F or l or L (optional) NOTE Either decimal integer or decimal fraction (but not both) can be omitted. Either decimal point or letter e (or E) with a signed integer exponent (but not both) can be omitted. These rules allow conventional and scientific (exponent) notations. Negative floating constants are taken as positive constants with an unary operator minus (-) prefixed.
- 6. TYPES There is total three types float no suffix defines double f F defines long double l L defines
- 7. SYNTAX floating-point-constant: fractional-constant exponent-part floating-suffix digit-sequence exponent-part floating-suffix fractional-constant: digit-sequence . digit-sequence digit-sequence . exponent-part: e sign digit-sequence E sign digit-sequence sign: one of + - digit-sequence: digit digit-sequence digit floating-suffix: one of f l F L
- 8. EXANPLE PROGRAM 1 2 3 4 5 6 7 8 9 1 0 #include<stdio.h> #include<conio.h> int main() { const float a = 2E-4; clrscr(); printf(“Value of a =%e”,a); getch(); return 0; } Output Value of a = 2.000000e-04
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