55 Data types main int a b c sum a 1 b 2 c 3 sum a b c printfsum is d sum main

55 data types main int a b c sum a 1 b 2 c 3 sum a b

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55 Data types main( ) { int a, b, c, sum; a = 1; b = 2; c = 3; sum = a + b + c; printf("sum is %d", sum); } main( ) { int a, b; float c, sum; a = 1; b = 2; c = 3.5; sum = a + b + c; printf("sum is %f", sum); }
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56 Numeric data types l char l Individual characters (Range 127 to -128) l int l Integers l Short (-65536 to 65535) or l Long -2,147,483,648 to 2,147,483,647 l float l Real numbers 3.4 E +/- 38 (32 bits long) l double l Real numbers with double precision 3.4 E +/- 308 (64 bits long) l Modifiers l Short (16 bit), long (32bit) l Control the range of numbers l signed, unsigned l for integers and whole numbers respectively
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57 Arithmetic Operators l Symbol Operation Usage l * multiply x * y l / divide x / y l % modulo x % y l + addition x + y l - subtraction x - y l All associate left to right. l * / % have higher precedence than + - .
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58 Special Operators: ++ and -- l Changes value of variable before (or after) its value is used in an expression. l Symbol Operation Usage l ++ postincrement x++ l -- postdecrement x-- l ++ preincrement ++x l <= predecrement --x l Pre : Increment/decrement variable before using its value. l Post : Increment/decrement variable after using its value.
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@2012 Badri Nath Computer Architecture 211 59 Examples l #include <stdio.h> #include <stdlib.h> int main() { char weight[4]; int w; w=140; printf("Here is what you weigh now: %i\n",w); w--; printf("w--: %i\n",w); w++; printf( ++w: %i\n",w); printf ( pre DECR %i \n , --w); printf ( post INCR %i \n , w++); printf ( value of w %i \n , w); return(0); } #include<stdio.h> main( ) { int i = 3, j = 4,k; k = i++ + --j; printf("i = %d, j = %d, k = %d",i,j,k); }
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60 Relational Operators l Symbol Operation Usage l > greater than x > y l >= greater than or equal x >= y l < less than x < y l <= less than or equal x <= y l == equal x == y l != not equal x != y l Result is 1 (TRUE) or 0 (FALSE). l Note : Don't confuse equality (==) with assignment (=).
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61 Logic Operators l Symbol Operation Usage l ! logical NOT !x l && logical AND x && y l || logical OR x || y l Treats entire variable (or value) as TRUE (non-zero) or FALSE (zero). l Result is 1 (TRUE) or 0 (FALSE).
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62 Bit operators l In C, there are operators that work on bits of a word l & logical AND l | inclusive OR l ~ NOT l Example l x = 8 y = 7 l x& y l x | y l ! X l E.g., 72 & 184 = 8 ; 72 | 184 = 248 ;
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@2012 Badri Nath Computer Architecture 211 63 Variable Declarations l Variables are used as names for data items. l Each variable has a type , which tells the compiler how the data is to be interpreted (and how much space it needs, etc.). l int counter; l int startPoint; l Float pi=3.14; l int is a predefined integer type in C. l #include <stdio.h> int main() { int pints=1; float price = 1.45; printf("You want %d pint.\n",pints); printf("That be $ %f, please.\n , price); return(0); }
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64 Control Structures l Same control structures as Java. Same syntax l Conditional l if l if-else l switch l Iteration l while l for l do-while l also has the break and continue expressions.
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65 Control Structures l Same control structures as Java. Same syntax l Conditional l if l if-else l switch l Iteration l while l for l do-while l also has the break and continue expressions.
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