Printing leading 0's in C
printf("%05d", zipCode);The 0 indicates what you are padding with and the 5 shows the width of the integer number.
Example 1: If you use "%02d" (useful for dates) this would only pad zeros for numbers in the ones column. E.g., 06 instead of 6.
Example 2: "%03d" would pad 2 zeros for one number in the ones column and pad 1 zero for a number in the tens column. E.g., number 7 padded to 007 and number 17 padded to 017.