#include <stdio.h>
 int scanf(const char *format, ...);
 int fscanf(FILE *stream, const char *format, ...);
 int sscanf(const char *str, const char *format, ...);
   

Examples

 int ret;
 int n,m;
  
 ret = scanf("%d%d", &n, &m);
   

The return value is the number of successful conversions.