Lab 2 Variables in C

Variables in C Character (one byte) Integer (2 bytes) char u; Integer (2 bytes) int a; Long Integer (4 bytes) long int a; Float (4 bytes) float x; Double (8 bytes) double z;

Variable Naming (Identifiers) Variable name includes: Letters a…z, A…Z Numbers 0…9 Underscore _ First character either letters (a…z, A…Z) or underscore ( _ ) Variable name doesn’t include: Spaces Other characters ! , @ : # … Reserved names (int, float, void … etc) A ≠ a

printf("format_string", argument_list); Printing Variables printf("format_string", argument_list); int a=898; float x=126.654; printf("%d %f\n", a, x); printf("a=%d x=%f\n", a, x); 898 126.654 a=898 x=126.654

Conversion Specification printf("a=%5d",a); printf("x=%6.2f",x); Field width a= 898 x=126.65 8 9 .Precision Field width 5 6 . 2 1

General Display Format % [flag] [field width] . [precision] Total=99.12345 %6.3f %7.3f %-7.3 99.123

Examples /* Lab2, student name, student ID */ #include <stdio.h> Void main(void) { int i; float x; double y; char q; // declaration i=325; x=345.65; y=5.010210210678; q=‘G’; // intialization Printf(“i=%d\ni=%5d\ni=%-5d\ni=%+5d\ni=%0d\n”,i,i,i,i,i); Printf(“\nx=%f\nx=%e\nx=%15.2e\nx=%15.4e\n”,x,x,x,x); Printf(“\ny=%lf\ny=%le\nq=%c\n”,y,y,q); }