Thread: Replacing string with another string with user-inputted position

Why don't you study how the likes of strcpy and strcat work, then start to base your ideas on how to solve the problem based on that knowledge.

I took three chars

Code:

#define MAX_LEN 256
st1[MAX_LEN];
st2{MAX_LEN]
st3{MAX_LEN]

In main, using fgets(string1, MAX_LEN, stdin) to get both start string, and substring. then scanf to get position to insert
chars are int as well %c to get letter in printf so you can (try to) see what is going on while doing this.

Code:

for ( i = pos; i < totalSize; i++)
{

    a = st3[i];
   printf("a = %c\n\n", a);


     if statment
     {
           // code
    }
   //code
}

loop copied srt1 ( main string) into st3 holding string
got total length using strlen for both main and substrings put that into a int var.
use st3 and keep track of where it is at in second loop. while within that second loop using an if statement ,you almost got it.

you need to keep a temp of main string, then over write the main string starting at insert position to end of substring,

then use that temp string to pick up where the substring left off at to complete the copy of what is left of the main string using the temp string back into that main string.

using an if statement inside of loop to copy substring into main string to check using size of subsrting against a starting point, which usually is 0. but not always. while using that and it looks like you know how to keep increment counts in loops to stop the loop and do the dirty work too.

sounds complicated, it kind of is, but not really when you get it figured out in your head then work out on paper. and use printf to see what is going on while coding compiling running checking then doing it again if needed. making needed adjustments along the way.

then when you get it figured out, shove it in a function, then make sure it still works.
I cannot draw array charts in this ...

Code:

int pos; tracker1, tracker2,

line 11. This doesn't make sense. I believe you only need one int variable anyway, so you should get rid of tracker1, tracker2.

Code:

char originalString[100], temporaryString[100]; blank[100];

line 12. Only two strings are needed here. You need the original and a temporary.

Code:

scanf("%s", &originalString[0]);
scanf("%s", &temporaryString[0]);

line 18 and 25. This is fine, but it might be redundant to use an address operator (&) as well as an index. They kind of counterbalance eachother. One cancels the other. A string name is converted into a pointer when it is passed into a function such as scanf, so while scanf asks for an address rather than a value, a string name provides that address. It works differently for integer variables because those hold values rather than addresses.

You haven't called stringInput() in main.

stringInput's function delcaration is missing types in its parameter list, and it lists blank[100] as a parameter which has not been given a value. Additionally, I think it would be preferable to create blank within the function as a temporary string which will go out of scope when the function returns. The modified string would then be the original string, but blank would be a copy of it while you still need a copy. The way I see the problem, you don't need the original strings once you have the final result.

As I was writing this though, I realized you don't even need a copy if you prepare the original string first by moving the end portion of the string to where it needs to be before you insert the middle portion. You can pick what you want to do.

Code:

int arrayoneTracker = 0;
int arraytwoTracker = 0;
int arraythreeTracker = 0;

line 34. I believe all the information you need should be contained in originalString, temporaryString, and pos. I don't believe these tracker variables are needed.

Code:

printf("

line 40. unfinished printf

Code:

for(int i = 0; i < pos; i++)
{
blank[i] = originalString[i];
}

line 42. I think this is okay, but there is a more concise way. To assign one string to another from its beginning, you can use char* strcpy(char* s1, char* s2).

Code:

for(int i = 0; i < length; i++)
{
blank[i] = temporaryString[i];  
}

line 51. I don't believe you want i to begin at 0. Don't you want it to begin at pos? Then it should also end at pos + length rather than just length. Again though, strcpy would be better. You just have to do something like this: strcpy(&originalString[pos], temporaryString). The address operator and the index will cancel eachother out and you will be writing at pos rather than at the 0 index.

Code:

return blank[];

line 67. Arrays get converted into pointers when passed into a function, which means the values persist and a return is not necessary. The function should probably just have a void return type.

String.replace() will replace every ocurrance in your input String:
String userInput = input.nextLine();
String replaced = userInput.replace("hate","love");[COLOR=#858C93][FONT=inherit]// Here you have your new string