sscanf

1
sscanf()
2
sscanf

• String scan function
• sscanf( ) consumes data from a memory resident
  buffer instead of consuming data from a file.
• Requires a format string to provide the
  formatting parameters for the data.
• sscanf( ) returns the number of items it
  successfully consumed from the buffer.

3
sscanf

• General format
• int sscanf(char str, const char format_str,
  )
• sscanf( ) consumes data from a memory resident
  buffer instead of consuming data from a file.
• Requires a format string to provide the
  formatting parameters for the data.
• sscanf( ) returns the number of items it
  successfully consumed from the buffer.

4
sscanf()

• / demonstrates the use of sscanf /
• include ltstdio.hgt
• include ltstdlib.hgt
• int main(int argc, char argv)
• char buffer80
• char month20
• char greet15
• char str90 "Hello 50 75 30"
• int day
• int year
• int nextYear
• int width
• int height
• int area
• int val5

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sscanf()

• / demonstrates the use of sscanf /
• // Using sscanf to format command line
  arguments
• if(argc lt 3)
• fprintf(stdout, "Expected s width
  height\n", argv0)
• exit(1)
• sscanf(argv1, "d", width)
• sscanf(argv2, "d", height)
• area width height
• fprintf(stdout, "\ndimensions d x d, area
  d\n",
• width, height, area)

6
sscanf()

• // Using sscanf to parse an input string .
• // fgets stores input in a character string.
• // must convert numeric characters to decimal
  values
• // before using in a computation. sscanf can
  do the
• // conversion.
• fgets(buffer, 80, stdin)
• sscanf(buffer, "s d d", month, day,
  year)
• nextYear year 1 // performs arithmetic
  on year
• fprintf(stdout, "\nDates\n")
• fprintf(stdout, "s d, d\n", month, day,
  year)
• fprintf(stdout, "s d, d\n", month, day,
  nextYear)

7
sscanf()

• // Using sscanf to parse a string
• // str is initialized above. sscanf converts
  the
• // numeric data to decimal values using d
• sscanf(str, "s d d d",
• greet, val0, val1, val2)
• fprintf(stdout, "\ns\nval0 d, val1 d,
  val2 d\n\n", greet, val0, val1, val2)
• return 0