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Application: Input Using scanf()

Standard I/O function scanf() to read formatted input
  • scanf() uses a format string like printf()
  • requires the address of a variable as argument

  • use %d to read an integer value   (%f for float, %lf for double) 

    #include <stdio.h>
…
int answer;
printf("Enter your answer: ");
scanf("%d", &answer);

  • scanf() returns a value — the number of items read
    • use this value to determine if scanf() successfully read a number
      • scanf() could fail e.g. if the user enters letters