效果图：
代码：
#include<stdio.h>int getLen(char a[]) {
int len = 0
while (a[len] != '\0')len++
return len
}
int find(char a[], char b[], int idx) {
int la = getLen(a), lb = getLen(b), t = la - lb, i, f
for ( idx <= t idx++) {
f = 0
for (i = 0 i < lb i++) {
if (a[idx + i] != b[i]) { f = 1 break }
}
if (f == 0)return idx
}
return -1
}
int main() {
char a[1024], b[1024], cmp[1025]
int i = 0, j , la, lc
scanf("%s", a)
scanf("%s", cmp)
scanf("%s", b)
la = getLen(a)
lc = getLen(cmp)
j = 0 - lc
while (1) {
j = find(a, cmp, j + lc)
if (j == -1) {
while (i < la) {
printf("%c", a[i++])
}
break
}
for ( i < j i++)printf("%c", a[i])
i += lc
printf("%s", b)
}
printf("\n")
}
答题不易，如无疑问，觉得可以的话，采纳一下
#include<stdio.h>#include <malloc.h>
#include <memory.h>
#include <string.h>
char *replace(char *str, const char *before, const char* after)
{
if (strcmp(before, after) == 0)
return str
char *ps = str
char* tmps
int fl
while (ps = strstr(ps, before))
{
tmps = (char*)malloc(ps - str + strlen(after) + 1)
memcpy(tmps, str, ps - str)
*(tmps + (ps - str)) = 0
strcat(tmps, after)
ps += strlen(before)
tmps=(char*)realloc(tmps, strlen(tmps) + strlen(ps) + 1)
fl = strlen(tmps)
strcat(tmps, ps)
strcpy(str, tmps)
ps = str + fl
free(tmps)
}
return str
}
int main()
{
char str[200] = "1223344222333444"
printf("%s\n", replace(str, "22", "ABC"))
return 0
}
#include<stdio.h>
#include <malloc.h>
#include <string.h>
char* fstr(char* str, const char* subs)
{
char* t = (char*)malloc(strlen(subs) + 1)
char* ps = str
int i
int slen = strlen(subs)
*(t + slen) = 0
while (strlen(ps) >= slen)
{
for (i = 0 i < slen ++i)
{
*(t + i) = *(ps + i)
}
if (strcmp(t, subs) == 0)
{
free(t)
return ps
}
++ps
}
free(t)
return NULL
}
char *replace(char *str, const char *before, const char* after)
{
if (strcmp(before, after) == 0)
return str
char *ps = str
char* tmps
int fl,i
while (ps = fstr(ps, before))
{
tmps = (char*)malloc(ps - str + strlen(after) + 1)
for (i = 0 i < ps - str ++i)
*(tmps + i) = *(str + i)
*(tmps + (ps - str)) = 0
strcat(tmps, after)
ps += strlen(before)
tmps = (char*)realloc(tmps, strlen(tmps) + strlen(ps) + 1)
fl = strlen(tmps)
strcat(tmps, ps)
strcpy(str, tmps)
ps = str + fl
free(tmps)
}
return str
}
int main()
{
char str[200] = "1223344222333444"
printf("%s\n", replace(str, "22", "ABC"))
return 0
}
