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Теми мають розпочинатися з літери або цифри, можуть містити дефіси (-) і не повинні перевищувати 35 символів.
75 рядки
1.5 KiB
75 рядки
1.5 KiB
/* Display value of fixed point numbers */
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#include <stdlib.h>
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#include <stdio.h>
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/* Extract hex/decimal/or float value from string */
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static int get_num_val(char *sval, unsigned *valp) {
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char *endp;
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/* See if it's an integer or floating point */
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int ishex = 0;
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int isfloat = 0;
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int i;
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for (i = 0; sval[i]; i++) {
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switch (sval[i]) {
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case 'x':
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case 'X':
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ishex = 1;
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break;
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case 'e':
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case 'E':
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if (!ishex)
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isfloat = 1;
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break;
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case '.':
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isfloat = 1;
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break;
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default:
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break;
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}
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}
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if (isfloat) {
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return 0; /* Not supposed to have a float here */
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} else {
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long long int llval = strtoll(sval, &endp, 0);
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long long int upperbits = llval >> 31;
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/* will give -1 for negative, 0 or 1 for positive */
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if (valp && (upperbits == 0 || upperbits == -1 || upperbits == 1)) {
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*valp = (unsigned) llval;
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return 1;
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}
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return 0;
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}
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}
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void show_int(unsigned uf)
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{
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printf("Hex = 0x%.8x,\tSigned = %d,\tUnsigned = %u\n",
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uf, (int) uf, uf);
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}
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void usage(char *fname) {
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printf("Usage: %s val1 val2 ...\n", fname);
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printf("Values may be given in hex or decimal\n");
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exit(0);
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}
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int main(int argc, char *argv[])
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{
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int i;
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unsigned uf;
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if (argc < 2)
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usage(argv[0]);
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for (i = 1; i < argc; i++) {
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char *sval = argv[i];
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if (get_num_val(sval, &uf)) {
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show_int(uf);
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} else {
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printf("Cannot convert '%s' to 32-bit number\n", sval);
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}
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}
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return 0;
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}
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