C programming language character set keywords constants variables data types
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This document provides an overview of the C programming language, detailing its character set, keywords, constants, variables, and data types. It includes definitions, examples, and rules for each category, highlighting the limitations and syntax for proper usage. The author, Sourav Ganguly, encourages readers to visit his YouTube channel for further learning resources.
![Character Set of C language…..
Character Set
Alphabets
A, B, C, D, ….. , W, X, Y, Z
a, b, c, d, ….., w, x, y, z
Digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Special symbols ~ ‘ ! @ # % ^ & * ( ) _ - + = | { } [ ] : ; " ' < > , . ? /
We may use those characters at the time of writing any C
programme. C compiler will support those characters.
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C programming language character set keywords constants variables data types
- 1. C language Character Set, Keywords, Constants, Variables, Data types Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 2. Sourav Ganguly Please visit my Youtube channel Step 1: go to www.google.com Step 2: Search for “sourav ganguly c programming”. Step 3: Click on my image bottom of the video. You will reach my channel. Youtube (direct link): https://www.youtube.com/channel/UCDsQskBhM107VIYLjg8kczg Website: http://www.startselfstudy.blogspot.in Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 3. Character Set of C language….. Keywords of C language….. Constants of C language….. Rules for Constructing Constants….. Variables of C language….. Rules for Constructing Variables….. Data types of C language….. Data types Range, Length and format….. Index Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 4. Character Set of C language….. Character Set Alphabets A, B, C, D, ….. , W, X, Y, Z a, b, c, d, ….., w, x, y, z Digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Special symbols ~ ‘ ! @ # % ^ & * ( ) _ - + = | { } [ ] : ; " ' < > , . ? / We may use those characters at the time of writing any C programme. C compiler will support those characters. Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 5. Keywords of C language….. You may use those keywords at the time of writing any C programme. Each keyword has it’s own meaning. You can’t use them for other purpose. Keywords or Reserved words void double default union int goto for extern float if do enum char else while sizeof short switch struct return long case const auto signed break static volatile unsigned continue typedef register Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 6. Constants of C language….. Example of constants Integer Constants +211, -80, 45 (assumed as +45) Real Constants (normal) +211.12, -80.12, 45.12 (assumed as +45.12) Real Constants (exponential) +1.5e-4, -0.5e+4, -1.5e-4, 1.4e5 (assumed as +1.4e5) Character Constants ‘D‘ , ‘d‘ , '5‘ , '=' Integer Constants Real Constants (normal) Real Constants (exponential) Character Constants (a) Must contain at least one digit. (b) No decimal point. (c) May be positive or negative. (d) No sign means positive. (e) Commas and blanks must not present in an integer constant. (a) Must contain at least one digit. (b) Contain decimal point. (c) May be positive or negative. (d) No sign means positive. (e) Commas and blanks must not present in an integer constant. . (a) Mantissa and exponential separated by a letter e. (b) The mantissa may be positive or negative. (c) No sign means positive. (d) The exponent Must contain at least one digit. May be positive or negative. No sign means positive. (a) Must contain at least one single alphabet, digit or special symbol. Within single inverted commas. (b)Maximum length is one character. Rules for Constructing Constants….. Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 7. Variables of C language….. Example of Variables Integer Variables int a=3; Real Variables float a=3.33; Character Variables char a=‘3’; Integer Variables Float Variables Character Variables (a) variable name must start with alphabet or underscore. (b) Do not use commas or blanks in a variable name. (c) Do not use any special symbol in a variable name except underscore (d) It is better to use short variable name for C compiler. (less than 31 character). (a) variable name must start with alphabet or underscore. (b) Do not use commas or blanks in a variable name. (c) Do not use any special symbol in a variable name except underscore (d) It is better to use short variable name for C compiler. (less than 31 character). (a) variable name must start with alphabet or underscore. (b) Do not use commas or blanks in a variable name. (c) Do not use any special symbol in a variable name except underscore (d) It is better to use short variable name for C compiler. (less than 31 character). Rules for Constructing Variables ….. Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 8. Data Types Data types Range length (bytes) format signed char -128 to + 127 1 %c unsigned char 0 to 255 1 %c short signed int -32768 to +32767 2 %d short unsigned int 0 to 65535 2 %u signed int -32768 to +32767 2 %d unsigned int 0 to 65535 2 %u long signed int -2147483648 to +2147483647 4 %ld long unsigned int 0 to 4294967295 4 %lu float -3.4e38 to +3.4e38 4 %f double -1.7e308 to +1.7e308 8 %lf long double -1.7e4932 to +1.7e4932 10 %Lf Example of Data type with Variables at the time of input and output Data Types printf() scanf() int a,b; printf(“%d %d”,a,b); scanf(“%d %d”,&a,&b); float a,b; printf(“%f %f”,a,b); scanf(“%f %f”,&a,&b); char a,b; printf(“%c %c”,a,b); scanf(“%c %c”,&a,&b); Data types of C language….. Data types Range, Length and format….. Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 9. Sourav Ganguly Please visit my Youtube channel Step 1: go to www.google.com Step 2: Search for “sourav ganguly c programming”. Step 3: Click on my image bottom of the video. You will reach my channel. Youtube (direct link): https://www.youtube.com/channel/UCDsQskBhM107VIYLjg8kczg Website: http://www.startselfstudy.blogspot.in Copyright © 2015 · Sourav Ganguly · All Rights Reserved.
- 10. Sourav Ganguly Please visit my Youtube channel Step 1: go to www.google.com Step 2: Search for “sourav ganguly c programming”. Step 3: Click on my image bottom of the video. You will reach my channel. Youtube (direct link): https://www.youtube.com/channel/UCDsQskBhM107VIYLjg8kczg Website: http://www.startselfstudy.blogspot.in Copyright © 2015 · Sourav Ganguly · All Rights Reserved.