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#include <stdio.h> #include <string.h> int delete(char *str,char *str_son,char *result_str) { int i = 0; int str_son_len = strlen(str_son); int str_len = strlen(str); int count = 0; if(strcmp(str,str_son) == 0) //两者相等，返回空； { result_str = NULL; printf("error!\n"); return 0; } if(str_len < str_son_len || str_son == NULL) //子串大于主串，或子串为空，输出主串 { while(*str != '\0') { *result_str = *str; str++; result_str++; } return 0; } while(*str != '\0') { while((*str != *str_son)&&( *str_son != '\0')) //两者不相等 { *result_str = *str; str ++; result_str ++; } if(strncmp(str,str_son,str_son_len) != 0) { *result_str = *str; str ++; result_str ++; } else { count ++; str += str_son_len; } } *result_str = '\0'; return count; } int main() { char str[100]; char t[20]; char s[100]; printf("please input str:\n"); scanf("%s",str); printf("please input son:\n"); scanf("%s",t); delete(str,t,s); printf("the result is :%s\n",s); return 0; }2、
#include<string.h> #include <stdio.h> #include <stdlib.h> #include <string.h> int main() { char a[20]; char *p=a; char *q; char *temp=(char*)malloc(sizeof(char)*20); int len; printf("please a:\n"); scanf("%s",a); printf("please temp:\n"); scanf("%s",temp); len = strlen(temp); while((q = strstr(p,temp)) != NULL) { strcpy(q,q+len); } puts(p); free(temp); return 0; }3、
/* src = "wangwangana" -> dest = "an" -> "wagwg" */ #include <stdio.h> #include <stdlib.h> static int delete(char *src,char *dest,char *result) { /* judge paramter */ if(src == NULL || dest == NULL) { return -1; } char *ptr = src; main string char *str = dest; sub string int count = 0; int i = 0; int flag; while(*ptr != '\0') { count = 0; //统计子串 和主串 相同的个数 flag = 0; 判断子串和主串是否存在第一个字符相同 while(*str != '\0' && *ptr == *str) { flag = 1; ptr++; str++; count++; } /* flag == 1 时，说明执行了上面的子串和主串*/ if(flag == 1) { if(*str == '\0') { str = dest; ///将子串str反回到原来dest continue; } else { str = dest; /* 将和主串不完全相同的子串部分 赋值给result*/ ptr = ptr - count; for(i = 0; i < count;i++) { *result = *ptr; ptr++; result++; } continue; } } /* 主串 和 子串 不一样的情况下 赋值给result*/ *result = *ptr; ptr++; result++; } *result = '\0'; return 0; } int main() { char *src; char *dest; char *result; src = (char *)malloc(100*sizeof(char)); dest = (char *)malloc(100*sizeof(char)); result = (char *)malloc(100*sizeof(char)); printf("please input src string:\n"); scanf("%s",src); printf("please input dest string:\n"); scanf("%s",dest); delete(src,dest,result); printf("result = %s\n",result); free(src); src = NULL; free(dest); dest = NULL; free(result); result = NULL; return 0; }