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Systems Programming Concepts with Example Makefile

Learn systems programming concepts with a sample Makefile defining the use of magic.h, sub.c, subB.c, and Arrays.c. Execute make and arrays.c for understanding these concepts.

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Systems Programming Concepts with Example Makefile

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  1. Make Example Systems Programming Concepts

  2. A make Example • Sample Makefile • magic.h and sub.c • subB.c • Arrays.c • make and arrays.c execution Systems Programming Make Example

  3. Sample Makefile OBJECTS= arrays.osub.osubB.o arrays: $(OBJECTS) gcc $(OBJECTS) -o $@ arrays.o: magic.h sub.o: subB.o: clean: rm -f *.o Systems Programming Make Example

  4. magic.h and sub.c magic.h sub.c extern int magic; #define SIZE 10 #include <stdio.h> void sub (int* aptr, int len) { int i; printf("S :"); for (i =0; i < len; i++) { aptr[i] = 2* (i + 1); printf (" %d", aptr[i]); } printf("\n"); } Systems Programming Make Example

  5. subB.c #include <stdio.h> int magic = 22; void subB (int x, int y, int z, int* aptr, intlen) { int i; int temp; printf ("B :"); printf (" x = %d , y = %d , z = %d \n", x,y,z); temp =z; z = y; y = x; x = temp; aptr[len - 1] = 77; printf ("B :"); printf (" x = %d , y = %d , z = %d \n", x,y,z); Systems Programming Make Example

  6. subB.c (cont.) printf ("B :"); for (i =0; i < len; i++) { printf (" %d", aptr[i]); } aptr[magic + x] = 33; printf("\n"); } Systems Programming Make Example

  7. arrays.c #include <stdio.h> #include "magic.h" int main() { void sub (); void subB (); int a[SIZE]; int i; printf("M :"); for (i = 0; i < SIZE; i++) { a[i] = i + 1; printf(" %d", a[i]); } printf("\n"); sub(a, SIZE); printf("M2:"); for (i = 0; i < SIZE/2; i++) { a[2*i] = 99 - 30*i; printf(" %d", a[2*i]); printf(" %d", a[2*i +1]); } Systems Programming Make Example

  8. arrays.c (cont) printf("\n"); subB(a[6],a[7],a[8], a, SIZE); printf("M3:"); magic = magic/4; a[magic] = 45; for (i = 0; i < SIZE; i++) { printf(" %d", a[i]); } printf("\n"); return 0; } Systems Programming Make Example

  9. make and arrays execution $ make cc -c -o arrays.o arrays.c cc -c -o sub.o sub.c cc -c -o subB.o subB.c gcc arrays.o sub.o subB.o -o arrays $ ./arrays M : 1 2 3 4 5 6 7 8 9 10 S : 2 4 6 8 10 12 14 16 18 20 M2: 99 4 69 8 39 12 9 16 -21 20 B : x = 9 , y = 16 , z = -21 B : x = -21 , y = 9 , z = 16 B : 99 4 69 8 39 12 9 16 -21 77 M3: 99 33 69 8 39 45 9 16 -21 77 Systems Programming Make Example

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