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How to convert a single char into an int
Character to integer in C
Can any body tell me how to convert a char to int?
char c[]={'1',':','3'};
int i=int(c[0]);
printf("%d",i);
When I try this it gives 49.
How to convert char to integer in C?
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2 Answers
In the old days, when we could assume that most computers used ASCII, we would just do
int i = c[0] - '0';
But in these days of Unicode, it's not a good idea. It was never a good idea if your code had to run on a non-ASCII computer.
Edit: Although it looks hackish, evidently it is guaranteed by the standard to work. Thanks @Earwicker.
The standard function atoi() will likely do what you want.
A simple example using "atoi":
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
int useconds = atoi(argv[1]);
usleep(useconds);
}
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