请您尝试以下方法:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ARYSIZE 100 // mamimum number of elements
/*
* show usage
*/
void
usage(char *cmd)
{
fprintf(stderr, "usage: %s -k value1:value2:..\n", cmd);
}
/*
* split str, store the values in ary, then return the number of elements
*/
int
parsearg(double *ary, char *str)
{
char *tk; // each token
char *err; // invalid character in str
char delim[] = ":"; // the delimiter
double d; // double value of the token
int n = 0; // counter of the elements
tk = strtok(str, delim); // the first call to strtok()
while (tk != NULL) { // loop over the tokens
d = strtod(tk, &err); // extract the double value
if (*err != '\0') { // *err should be a NUL character
fprintf(stderr, "Illegal character: %c\n", *err);
exit(1);
} else if (n >= ARYSIZE) { // #tokens exceeds the array
fprintf(stderr, "Buffer overflow (#elements should be <= %d)\n", ARYSIZE);
exit(1);
} else {
ary[n++] = d; // store the value in the array
}
tk = strtok(NULL, delim); // get the next token (if any)
}
return n; // return the number of elements
}
int
main(int argc, char *argv[])
{
int i, n;
double ary[ARYSIZE];
if (argc != 3 || strcmp(argv[1], "-k") != 0) {
// validate the argument list
usage(argv[0]);
exit(1);
}
n = parsearg(ary, argv[2]); // split the string into ary
for (i = 0; i < n; i++) { // see the results
printf("[%d] = %f\n", i, ary[i]);
}
}
如果您执行编译的命令,例如:
./a.out -k "0.0:-1.0:0.0:-1.0:4.0:-1.0:0.0:-1.0:0.0"
它将输出:
[0] = 0.000000
[1] = -1.000000
[2] = 0.000000
[3] = -1.000000
[4] = 4.000000
[5] = -1.000000
[6] = 0.000000
[7] = -1.000000
[8] = 0.000000
如果您在字符串中输入了无效字符,程序将打印错误消息并中止。