Created
July 23, 2011 06:04
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integer to binary string
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <limits.h> | |
| char *itob(char *buffer, int x) | |
| { | |
| unsigned int z = INT_MAX + 1U; | |
| char *buf = buffer; | |
| do | |
| { | |
| if (z & x) | |
| *buffer++ = '1'; | |
| else if (buf != buffer) | |
| *buffer++ = '0'; | |
| } while (z = z >> 1); | |
| if (x == 0) *buffer++ = '0'; | |
| *buffer = '\0'; | |
| return buf; | |
| } | |
| int main(int argc, char *argv[]) | |
| { | |
| int x; | |
| char buffer[43]; | |
| if (argc == 2) | |
| { | |
| x = atoi(argv[1]); | |
| printf("%d to binary: %s \n", x, itob(buffer,x)); | |
| } else { | |
| printf("enter a number.\n"); | |
| } | |
| return 0; | |
| } |
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