Digits

Consider the following header file:

myheader.h

1. #ifndef _MYHEADER_H
2. #define _MYHEADER_H 1
4. void foo(char *, const char *);
6. #endif /* myheader.h */

Write the foo() function declared in myheader.h that takes the address of two strings as parameters. The function should concatenate the digit characters in the second string into a single string and store this string at the memory location pointed to by the first parameter.

Note

Place the function in a file named foo.c and submit this file as a solution to the evaluation system. You can test your solution using the following files. The evaluation system does not necessarily perform the evaluation using these files.

main.c

1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <string.h>
4. #include "myheader.h"
6. int main()
7. {
8.     char source[100], destination[100];
9.     while (fgets(source, 100, stdin) != NULL)
10.     {
11.         if (source[strlen(source) - 1] == '\n')
12.             source[strlen(source) - 1] = '\0';
13.         foo(destination, source);
14.         printf("%s\n", destination);
15.     }
16.     return EXIT_SUCCESS;
17. }

Makefile

1. SRCS = main.c foo.c
2. OBJS = $(SRCS:%.c=%.o)
3. TARGETS = main
5. .PHONY: clean
7. all: $(TARGETS)
9. main: $(OBJS)
10. $(CC) $(OBJS) -o main
12. %.o: %.c
13. $(CC) -Wall -c $< -o $@
15. clean:
16. rm -rf $(OBJS) *~ $(TARGETS)

Sample Input

1. A1B2C3
2. ABC123
3. ABCDEF
4. 123456

Output for Sample Input

1. 123
2. 123
4. 123456

One possible solution is available in: main.c.