58 lines
1002 B
C
58 lines
1002 B
C
#include "stdio.h"
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void _reverse(char *start,char *end){
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if ((start == NULL) || (end == NULL)) return;
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while(start < end){
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char tmp = *start;
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*start = *end;
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*end = tmp;
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start++,
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end--;
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}
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}
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char *_revert_by_word(char *source){
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char *end = source;
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char *start = source;
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while(*start != '\0'){
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if (*start == ' '){
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start++;
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end++;
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}else if(*end == ' ' || *end == '\0'){
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_reverse(start,end-1);
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start = end;
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}else{
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end++;
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}
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}
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return source;
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}
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char *revert_by_word(char *source){
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char *end = source;
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char *start = source;
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if (source == NULL) return NULL;
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while (*end != '\0') end++;
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end--;
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/*整个句子逆序*/
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_reverse(start,end);
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/*按单词逆序.tneduts a ma I */
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_revert_by_word(source);
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return source;
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}
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//为啥运行时 bus error？
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int main(int argc, char const *argv[])
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{
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char *test = "how are you ?";
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printf("%s\n",_revert_by_word(test));
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//char *test = "I am a student.";
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//printf("%s\n",revert_by_word(test));
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return 0;
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}
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