48 lines
841 B
C
48 lines
841 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <stdbool.h>
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#include <string.h>
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// !字符串函数string.h
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/*
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1.string.h
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strlen、strcmp、strcpy、strcat、strchr、strstr
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2.strlen
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size_t strlen(const char *s);
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返回s的字符串长度（不包括结尾的0)
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3.strcmp
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int strcmp(const char *s1, const char *s2); 比较两个字符串，返回:
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0:s1==S2
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1:s1>s2
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-1:s1<s2
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*/
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int my_strcmp(const char *s1, const char *s2)
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{
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int idx = 0;
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while (s1[idx]!='\0' && s1[idx] == s2[idx])
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{
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idx++;
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}
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return s1[idx] - s2[idx];
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}
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int main(void)
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{
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/* strcmp */
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char s1[] = "abc";
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char s2[] = "abc";
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printf("strcmp=%d\n", strcmp(s1, s2));
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char s3[] = "abc";
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char s4[] = "bbc";
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printf("strcmp=%d\n", strcmp(s3, s4));
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char s5[] = "abc";
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char s6[] = "Abc";
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printf("strcmp=%d\n", strcmp(s5, s6));
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return 0;
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} |