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Replace all spaces in a String with ‘%20′

Objec­tive: Write an algo­rithm to replace all spaces in a given string with ‘%20′. You can con­sider that string has enough space at the end of the string to hold the extra characters.

Input: A String and true length of a string

Out­put: Updated string in which each space is replaced by the ‘%20′


Input String : I am Sumit Jain    

Output String : I%20am%20Sumit%20Jain


  • Count the total spaces in a string in one iter­a­tion, say the count is spaceCount
  • Cal­cu­late the new length of a string by newLength = length + 2*spaceCount; (we need two more places for each space since %20 has 3 char­ac­ters, one char­ac­ter will occupy the blank space and for rest two we need extra space)
  • Do another iter­a­tion in reverse direction
  • If you encounter the space, for next 3 spaces put %,2,0.
  • If you encounter the char­ac­ter, copy it

Com­plete Code:


Input String : I am Sumit Jain
Output String : I%20am%20Sumit%20Jain

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