37_pdfsam_cs2022_lectures

37_pdfsam_cs2022_lectures - Multiple source files Breaking...

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Multiple source files Breaking up program into several source files Unlike Java, it doesn’t require you to do this How you break up the program is up to you To do this, Put the code for a function in exactly one file Put a function prototype in any file that uses the function Advantages Organization No need to recompile unchanged files: save time
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Example: multiple source files #include <stdio.h> int power(int base, int exp); int cube(int base); int main(void) { printf(“%d\n”, power(5, 3)); printf(“%d\n”, cube(10)); return 0; } int power( int base, int exp ) { int i, p = 1; for( i = 1; i <= exp; i++ ) p *= base; return p; } int power(int base, int exp); int cube(int base) { return power(base, 3); } main.c power.c cube.c
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Header files A C header file contains function prototypes But does not contain implementation code Files have extension .h by convention e.g. a snippet of stdio.h: void perror(char *); int printf(char *, ...); int putc(int, FILE *); int putchar(int); int puts(char *); int remove(char *); int rename (char *, char *); void rewind(FILE *); int scanf(char *, ...);
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Example: header files
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