в 14:20, 25 мая 2010

2010-05-25T14:20:56Z

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2010-05-25T10:22:04Z

1 версия: Импорт контента...

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==Copy a file in debug mode==

<source lang="cpp">
#include <stdio.h>
#include <stdlib.h>
#define DEBUG
int main(int argc, char *argv[])
{
FILE *from, *to;
char ch;
/* check number of command line arguments */
if( argc != 3) {
printf("Usage: copy <source> <destination>\n");
exit(1);
}
/* open source file */
if((from = fopen(argv[1], "rb"))==NULL) {
printf("Cannot open source file.\n");
exit(1);
}
/*open destination file */
if((to = fopen (argv[2], "wb")) ==NULL) {
printf("Cannot open destination file.\n");
exit(1);
}
while(!feof(from)) {
ch = fgetc(from);
if(ferror(from)) {
printf("Error reading source file.\n");
exit(1);
}
if(!feof(from)) {
fputc(ch, to);
}
if(ferror(to)) {
printf("Error writing destination file.\n");
exit(1);
}
}
fclose(from);
fclose(to);
return 0;
}

</source>

==Copy a file in four debug level==

<source lang="cpp">
#include <stdio.h>
#include <stdlib.h>
/* DEBUG levels:
0: no debug
1: display byte read from source file
2. display byte written to destination file
3: display bytes read and bytes written
*/
#define DEBUG 2
int main(int argc, char *argv[])
{
FILE *in, *out;
unsigned char ch;
/* see if correct number of command line arguments */
if(argc!=4) {
printf("Usage: code <in> <out> <key>");
exit(1);
}
/* open input file */
if((in = fopen(argv[1], "rb"))==NULL) {
printf("Cannot open input file.\n");
exit(1);
}
/* open output file */
if((out = fopen(argv[2], "wb"))==NULL) {
printf("Cannot open output file.\n");
exit(1);
}
while(!feof(in)) {
ch = fgetc(in);
#if DEBUG == 1 || DEBUG == 3
putchar(ch);
#endif
ch = *argv[3] ^ ch;
#if DEBUG >= 2
putchar(ch);
#endif
if(!feof(in)) fputc(ch, out);
}
fclose(in);
fclose(out);
return 0;
}

</source>

==Debugging using pre-processing directives==

<source lang="cpp">
#include <stdio.h>
#include <stdlib.h>
#define test
#define testf
int sum(int, int);
int product(int, int);
int difference(int, int);
int main()
{
int i = 0;
int j = 0;
int a = 10, b = 5;
int result = 0;
int (*pfun[3])(int, int);

pfun[0] = sum;
pfun[1] = product;
pfun[2] = difference;
for(i = 0 ; i < 3 ; i++)
{
j = i;
#ifdef test
printf("\nRandom number = %d", j );
#endif
result = pfun[j](a , b);
printf("\nresult = %d", result );
}
result = pfun[1](pfun[0](a , b), pfun[2](a , b));
printf("\n\nThe product of the sum and the difference = %d\n", result);
}
int sum(int x, int y){
#ifdef testf
printf("\nFunction sum called.");
#endif
return x + y;
}
int product( int x, int y ){
#ifdef testf
printf("\nFunction product called.");
#endif
return x * y;
}
int difference(int x, int y){
#ifdef testf
printf("\nFunction difference called.");
#endif
return x - y;
}

</source>

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в 14:20, 25 мая 2010

Admin: 1 версия: Импорт контента...