37 lines
581 B
C
37 lines
581 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.
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*/
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int my_strlen(const char *s)
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{
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int idx = 0;
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while (s[idx]!='\0')
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{
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idx++;
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}
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return idx;
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}
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int main(void)
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{
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/* strlen */
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char line[] = "Hello";
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printf("strlen=%lu\n", strlen(line));
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printf("my_strlen=%d\n", my_strlen(line));
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printf("sizeof=%lu\n", sizeof(line));
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return 0;
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} |