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Add #include <stdlib.h>

and just before return 0; add a system("PAUSE");

Thanks for these hints. For me right now it's not important making the program fast, but working. The fact is I don't really quite get it how to create that vocal stuff.

char vocals[] = "aeiou";...

The requierments of the program are like this: "It reads from the keyboard a phrase of maximum 70 chars. Display one line under the other all the pairs of running vocals from the phrase as well as...

Thanks! Work fine now ;)

The matrix has 5 columns and 1 lines.
This output is for the example I gave.

I write a matrix in a text file as it shows the example:

2 5 2 5 6
2 3 4 6 3
2 5 6 8 6

I want to find out the number of lines and columns. I've started writing the code but I can't determine...