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- Listing 2
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- #include <stdio.h>
-
- typedef int MAT[4][4];
-
- main()
- {
- MAT matA, matB;
- int i, j, fd, n = 4;
- char *cptr;
-
- puts("\014\n\n ENTER MATRIX ROW BY ROW");
-
- for (i = 0; i < n; ++i)
- for(j = 0; j < n; ++j)
- scanf("%d", &matA[i][j]);
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- fd = creat("mats.data",4);
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- cptr = matA; /*no cast -- even tho the scalar of matA is 32 */
-
- write(fd, cptr, sizeof(MAT)); /* cptr is taken to be the
- pointer to an array of 32 char */
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- close(fd);
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- fd = open("mats.data",2);
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- cptr = matB; /* cptr now points to the other matrix -- no
- cast */
- read(fd, cptr, sizeof(MAT));
- close(fd);
-
- puts("\n\n\n");
- for (i = 0; i < n; ++i)
- {
- for (j = 0; j < n; ++j) /* 4 x 4 matrix of */
- printf("%4d", matB[i][j]); /* integers is
- output */
- putchar('\n'); /* to screen */
- }
- }
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