69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
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#include <detpic32.h>
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#define SIZE 20
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char *strcat(char *, char *);
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char *strcpy(char *, char *);
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int strlen(char *);
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int strcmp(char *str1, char *str2);
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int main(void) {
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static char str1[SIZE + 1];
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static char str2[SIZE + 1];
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static char str3[2 * SIZE + 1];
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printStr("Introduza 2 strings:\n");
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readStr(str1, SIZE);
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putChar('\n');
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readStr(str2, SIZE);
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putChar('\n');
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printStr("Resultados:\n");
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printStr("Str1 len: ");
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printInt(strlen(str1), 10);
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putChar('\n');
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printStr("Str2 len: ");
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printInt(strlen(str2), 10);
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putChar('\n');
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strcpy(str3, str1);
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printStr("Str3 + Str2: ");
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printStr(strcat(str3, str2));
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putChar('\n');
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printStr("Str1 == Str2: ");
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printInt10(strcmp(str1, str2));
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putChar('\n');
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return 0;
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}
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// Returns the length of string "str" (excluding the null character)
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int strlen(char *str) {
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int len;
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for (len = 0; *str != '\0'; len++, str++);
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return len;
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}
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// Copy the string pointed by "src" (including the null character) to
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// destination (pointed by "dst")
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char *strcpy(char *dst, char *src) {
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char *p = dst;
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for (; (*dst = *src) != '\0'; dst++, src++);
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return p;
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}
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// Concatenates "dst" and "src" strings
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// The result is stored in the "dst" string
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char *strcat(char *dst, char *src) {
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char *p = dst;
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for (; *dst != '\0'; dst++);
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strcpy(dst, src);
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return p;
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}
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// Compares two strings, character by character
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// Returned value is:
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// < 0 string "str1" is "less than" string "str2" (first
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// non-matching character in str1 is lower, in ASCII, than that of str2)
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// = 0 string "str1" is equal to string "str2"
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// > 0 string "str1" is "greater than" string "str2" (first
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// non-matching character in str1 is greater, in ASCII, than that of str2)
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int strcmp(char *str1, char *str2) {
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for (; (*str1 == *str2) && (*str1 != '\0'); str1++, str2++);
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return (*str1 - *str2);
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}
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