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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int main(void) {
  5. 	char format[20] = {0};
  6. 	char buf[50] = {0};
  7. 	char str[] = "Hello World! How are you?";
  8. 	size_t howMuchToRead = 8;
  9.  
  10. 	/* Using sscanf - till whitespace or size specified */
  11. 	snprintf(format, sizeof format, "%%%zus", howMuchToRead);
  12. 	sscanf(str, format, buf);
  13. 	printf("Using sscanf with %%8s format :%s\n", buf);
  14.  
  15. 	/* Using sscanf - read everything upto newline */
  16. 	snprintf(format, sizeof format, "%%%zu[^\n]", howMuchToRead);
  17. 	sscanf(str, format, buf);
  18. 	printf("Using sscanf with %%8[^\\n] format :%s\n", buf);
  19.  
  20. 	/* Using precision specifier */
  21. 	snprintf(format, sizeof format, "%%.%zus", howMuchToRead);
  22. 	snprintf(buf, sizeof buf, format, str);
  23. 	printf("Using precision specifier :%s\n", buf);
  24. 	return 0;
  25. }
Success #stdin #stdout 0.02s 1720KB
comments (?)
stdin 
Standard input is empty
stdout 
Using sscanf with %8s format :Hello
Using sscanf with %8[^\n] format :Hello Wo
Using precision specifier :Hello Wo
https://ideone.com/XMrhq
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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