how to concatenate an integer and a string from an array

Question

I have an array of integers and an array of chars.

int A[5] = {12, 23, 12, 32, 12};
char B[5] = {'a', 'e', 'd', 'y', 'i'};

I want to concatenate the two in order into a new array called

char P[5];

I want to output to be

p[5] =  {12a, 23e, 12d, 32y, 56i}

So far I tried using snprintf but it runs into segment fault and abort trap 6. Is there a simpler way to do this ?

You need [5] in the array declarations for A, B and P, since each one will be storing five elements. snprintf is probably the simplest solution without using a non-standard library. Could your array sizing be the cause of your segfault? — user234461
– user234461, Commented May 25, 2017 at 17:32
@user234461 : not sure, could you write up a little function that could help me out please — Stack Overflow
– Stack Overflow, Commented May 25, 2017 at 17:33

vinayawsm · Accepted Answer · 2017-05-25 18:23:16Z

2

You cannot have a char array storing values like '12e' at each index, you need a 2D-char array (which is an array of strings). You can use sprintf for data type conversion.

int A[5] = {12, 23, 12, 32, 12};
char B[5] = {'a', 'e', 'd', 'y', 'i'};
char P[5][15];
int i = 0;
for(i = 0; i < 5; ++i)
{
    sprintf(P[i], "%d%c",A[i],B[i]);
    printf("%s ",P[i]);
}

output: 12a 23e 12d 32y 12i

edited May 25, 2017 at 18:23

answered May 25, 2017 at 17:58

vinayawsm

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2 Comments

Justin J. Over a year ago

If you want to simplify, replace the first 4 lines in the for loop with sprintf(P[i],"%d%c",A[i], B[i]);

vinayawsm Over a year ago

That's cool. Updated my answer accordingly. Thank you Justin.

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