sprintf in C resets the value of counting variable [duplicate]

Question

I'm having an issue with sprintf in C resetting the value of a counter variable when I run it. Here in a nutshell is what is happening:

int count = 0;
count++;
printf("%d\n", count); // count will equal 1
char title[7];
sprintf(title, "%.3d.jpg", count);
printf("%d\n", count); // count now equals 0 again

Is this normal behavior for sprintf?

Answer 1

title is too small, sprintf is writing beyond the bounds of title, and writing into count, corrupting its value.

Note that title needs to be long at least 8 bytes: 3 for %.3d, 4 for .jpg and 1 for the terminator \0.

As Grijesh Chauhan points out, you can make sure that you never write beyond the allocated size of the string by using snprintf, i.e.:

char title[8];
snprintf(title, sizeof(title), "%.3d.jpg", count);