I want to find out word from string and replace with new word.

[abcmavdi]

I want to write a code which replace words from string.without use of string function in c language.

Example str = "This is string" remove "is" from string and replace with "was".
so, finally str = "This was string".

[weaknessforcats]

Have you written down the steps to do this on paper?

A string is just an array of char with a \0 as the last element.

You could write a function with a string argument that compares two strings for equality.

Then you could write another function that has two string arguments that compares the first argument to the second argument by calling the compare function you just wrote. It starts with the first character of the first argument and if not equal repeats starting with the second character and so on. If a match is found, the function returns the location of the start of the match.

Now you know where the insert goes. So you write yet another function that takes the original string plus an argument for the string to insert plus an argument for the starting location. It copies the original string to a temp string up to the point of insertion, then copies the string to insert, then copies the rest of the original string.

I leave the memory management to you.

[curiously enough]

Code removed per Posting Guidelines

Important note: If you have two or more idetical words in the string and want to replace one of them, the far left one will automatically be replaced.

[weaknessforcats]

I'm sorry but is there a problem with this code? You don't say.

[curiously enough]

I'm sorry but is there a problem with this code? You don't say.

Please explain. Where did you find something wrong?

[weaknessforcats]

I didn't say I found anything wrong. Usually when code is posted there is a probem with but you didn't say there was a problem with this code so I asked you what the problem was.

Are you saying this code is OK for you and you are just posting your finished product?

[boxfish]

I think curiously enough is providing abcmavdi with the code (s)he asked for. It seems to me that there is some sort of misunderstanding here.

[curiously enough]

I made a mistake in the code, the null charachter is used wrong, here is the code without the error:

Full code removed per Posting Guidelines