Concatenate char array and int array and store in string array

Question

I would like to concatenate char array and the int array and store them in another char array. How could I do that?

Here is the code so far

char letter[100];
int number[100], i;

char * letterNum[100];

for (i = 0; i < 100; i++){
 letterNum[i] = strcat(letter[i], number[i]);
}

expected output should be

a1
b1
...

What is a string array? [Hint: you already told char array] — Sourav Ghosh
– Sourav Ghosh, Commented Jun 19, 2015 at 7:13

Iharob Al Asimi · Accepted Answer · 2015-06-19 07:06:36Z

2

The strcat() function concatenates strings not chars, you need sprintf()

sprintf(letterNum[i], "%c%d", letter[i], number[i]);

and also, letterNum in your case is an array of pointers, it should be an array of arrays, like

char letterNum[100][3];

and then, you can use snprintf() instead of sprintf() to prevent buffer overflow

if (snprintf(letterNum[i], 3, "%c%d", letter[i], number[i]) > 2)
    youHaveToDoSomethin_An_Error_Occurred();

edited Jun 19, 2015 at 7:06

answered Jun 19, 2015 at 7:00

Iharob Al Asimi

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Community · Accepted Answer · 2017-05-23 10:28:21Z

I guess Mr. Iharob already answered your question, but just to elaborate a bit more,

Let's see the man page of strcat(). It says,

char *strcat(char *dest, const char *src);

which means it expects both the arguments to be pointer to strings. Now, as we know, a pointer to int array cannot be considered a string, we cannot use strcat() directly in your case.

So, what you have to do is,

Take another buffer
Copy both the contents of the char array and int array elements for particular index one after another in lexicographical format, so that the final result is the concatenation of both.

Now, you have sprintf()/ snprintf() to help you out in this case. It prints the formatted o/p to the supplied string.

A pseudo-code

char letter[100];   //populating value, not shown
int number[100];    //populating value, not shown

int i = 0;

char letterNum[100][32];

for (i = 0; i < 100; i++){
 if ( sprintf(letterNum[i], "%c%d", letter[i], number[i]) != 2)
             printf("Error in %d iteration\n", (i+1));
}

help · Accepted Answer · 2015-06-20 20:16:11Z

0

Thank you very much for your help! I guess, I need to try an error and test it out myself... the explaination was clear and helpful... plus given codes for me to eeasily understand... Your kind help is greatly aappreciated.. Thank you once again

answered Jun 20, 2015 at 20:16

help

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