\u6807\u51c6IO（Standard Input\/Output）\u662fC\u8bed\u8a00\u4e2d\u7528\u4e8e\u5904\u7406\u6587\u4ef6\u548c\u6570\u636e\u6d41\u7684\u4e00\u7ec4\u51fd\u6570\u5e93，\u5b9a\u4e49\u5728<stdio.h>\u5934\u6587\u4ef6\u4e2d\u3002\u4e0e\u4f4e\u7ea7IO（\u5982read\/write）\u76f8\u6bd4，\u6807\u51c6IO\u63d0\u4f9b\u4e86\u7f13\u51b2\u673a\u5236，\u63d0\u9ad8\u4e86\u6570\u636e\u8bfb\u5199\u7684\u6548\u7387\u3002\u6807\u51c6IO\u7684\u6838\u5fc3\u662fFILE\u7ed3\u6784\u4f53\u6307\u9488，\u901a\u8fc7\u5b83\u64cd\u4f5c\u6587\u4ef6\u6d41\u3002<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
FILE *fopen(const char *filename, const char *mode);
\nint fclose(FILE *stream);<\/p>\n
\u53c2\u6570\u8bf4\u660e<\/p>\n
\u793a\u4f8b<\/p>\n
FILE *fp = fopen("test.txt", "w");
\nif (fp == NULL) {
\n perror("Error opening file");
\n return 1;
\n}
\nfclose(fp);<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
int fgetc(FILE *stream);
\nint fputc(int c, FILE *stream);<\/p>\n
\u793a\u4f8b<\/p>\n
FILE *fp = fopen("test.txt", "r");
\nint ch = fgetc(fp); \/\/ \u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26
\nfputc('A', fp); \/\/ \u5199\u5165\u5b57\u7b26'A'<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
char *fgets(char *str, int n, FILE *stream);
\nint fputs(const char *str, FILE *stream);<\/p>\n
\u53c2\u6570\u8bf4\u660e<\/p>\n
\u793a\u4f8b<\/p>\n
char buffer[100];
\nfgets(buffer, 100, stdin); \/\/ \u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6
\nfputs("Hello", stdout); \/\/ \u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
int fscanf(FILE *stream, const char *format, …);
\nint fprintf(FILE *stream, const char *format, …);<\/p>\n
\u793a\u4f8b<\/p>\n
int num;
\nfscanf(fp, "%d", &num); \/\/ \u4ece\u6587\u4ef6\u8bfb\u53d6\u6574\u6570
\nfprintf(fp, "Number: %d", 42); \/\/ \u5199\u5165\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
\nsize_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);<\/p>\n
\u53c2\u6570\u8bf4\u660e<\/p>\n
\u793a\u4f8b<\/p>\n
int arr[5] = {1, 2, 3, 4, 5};
\nfwrite(arr, sizeof(int), 5, fp); \/\/ \u5199\u5165\u6570\u7ec4
\nfread(arr, sizeof(int), 5, fp); \/\/ \u8bfb\u53d6\u6570\u7ec4<\/p>\n
\u529f\u80fd<\/p>\n
\u51fd\u6570\u539f\u578b<\/p>\n
int fseek(FILE *stream, long offset, int whence);
\nvoid rewind(FILE *stream);
\nlong ftell(FILE *stream);<\/p>\n
\u53c2\u6570\u8bf4\u660e<\/p>\n
\u793a\u4f8b<\/p>\n
fseek(fp, 10, SEEK_SET); \/\/ \u79fb\u52a8\u5230\u7b2c10\u5b57\u8282
\nrewind(fp); \/\/ \u56de\u5230\u6587\u4ef6\u5f00\u5934
\nlong pos = ftell(fp); \/\/ \u83b7\u53d6\u5f53\u524d\u4f4d\u7f6e<\/p>\n
#include "..\/head.h"<\/p>\n
int main(void)
\n{
\n FILE *fsrc = NULL;
\n FILE *fdst = NULL;
\n ssize_t nret = 0;
\n char srcfile[256] = {0};
\n char dstfile[256] = {0};
\n char tmpbuff[4096] = {0};<\/p>\n
printf("\u8bf7\u8f93\u5165\u6e90\u56fe\u7247:\\\\n");
\n fgets(srcfile, sizeof(srcfile), stdin);
\n srcfile[strlen(srcfile)-1] = '\\\\0';
\n printf("\u8bf7\u8f93\u5165\u76ee\u7684\u56fe\u7247:\\\\n");
\n fgets(dstfile, sizeof(dstfile), stdin);
\n dstfile[strlen(dstfile)-1] = '\\\\0';<\/p>\n
fsrc = fopen(srcfile, "r");
\n if (NULL == fsrc)
\n {
\n perror("fail to fopen");
\n return -1;
\n }<\/p>\n
fdst = fopen(dstfile, "w");
\n if (NULL == fdst)
\n {
\n perror("fail to fopen");
\n return -1;
\n }<\/p>\n
while (1)
\n {
\n nret = fread(tmpbuff, 1, sizeof(tmpbuff), fsrc);
\n if (0 == nret)
\n {
\n break;
\n }
\n fwrite(tmpbuff, 1, nret, fdst);
\n }<\/p>\n
fclose(fsrc);
\n fclose(fdst);<\/p>\n
return 0;
\n}<\/p>\n
#include "..\/head.h"
\n#include "cirlist.h"<\/p>\n
int find_max_char(char *filename, int *pmaxchar, int *pmaxcnt)
\n{
\n FILE *fp = NULL;
\n linknode *pcirlist = NULL;
\n linknode *ptmpnode = NULL;
\n char ch = 0;<\/p>\n
pcirlist = create_empty_linklist();<\/p>\n
fp = fopen(filename, "r");
\n if (NULL == fp)
\n {
\n perror("fail to fopen");
\n return -1;
\n }<\/p>\n
while (1)
\n {
\n ch = fgetc(fp);
\n if (EOF == ch)
\n {
\n break;
\n }<\/p>\n
\/* \u5982\u679c\u7b2c\u4e00\u6b21\u51fa\u73b0\u5219\u65b0\u589e\u8be5\u8282\u70b9 *\/
\n ptmpnode = find_linklist(pcirlist, ch);
\n if (NULL == ptmpnode)
\n {
\n insert_tail_linklist(pcirlist, ch);
\n }<\/p>\n
\/* \u4ece\u94fe\u8868\u4e2d\u627e\u5230\u8282\u70b9，\u8ba1\u6570\u5668\u81ea\u52a0 *\/
\n ptmpnode = find_linklist(pcirlist, ch);
\n ptmpnode->cnt++;
\n }<\/p>\n
fclose(fp);<\/p>\n
ptmpnode = find_max_node(pcirlist);
\n if (ptmpnode != NULL)
\n {
\n *pmaxchar = ptmpnode->data;
\n *pmaxcnt = ptmpnode->cnt;
\n }<\/p>\n
destroy_linklist(&pcirlist);<\/p>\n
return 0;
\n} <\/p>\n
int main(void)
\n{
\n char filename[256] = {0};
\n int maxcnt = 0;
\n int maxchar = 0;
\n int ret = 0;<\/p>\n
printf("\u8bf7\u8f93\u5165\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u540d:\\\\n");
\n m_fgets(filename);<\/p>\n
ret = find_max_char(filename, &maxchar, &maxcnt);
\n if (ret != 0)
\n {
\n printf("fild max char failed\\\\n");
\n return -1;
\n }<\/p>\n
printf("\u51fa\u73b0\u6700\u591a\u7684\u5b57\u7b26:%c, \u6b21\u6570:%d\\\\n", maxchar, maxcnt);<\/p>\n
return 0;
\n}<\/p>\n
#include "..\/head.h"<\/p>\n
int find_max_char(char *filename, int *pmaxchar, int *pmaxcnt)
\n{
\n FILE *fp = NULL;
\n int cnt[256] = {0};
\n char ch = 0;
\n int max = 0;
\n int i = 0;<\/p>\n
fp = fopen(filename, "r");
\n if (NULL == fp)
\n {
\n perror("fail to fopen");
\n return -1;
\n }<\/p>\n
while (1)
\n {
\n ch = fgetc(fp);
\n if (EOF == ch)
\n {
\n break;
\n }
\n cnt[ch]++;
\n }<\/p>\n
fclose(fp);<\/p>\n
max = 0;
\n for (i = 1; i < 256; i++)
\n {
\n if (cnt[i] > cnt[max])
\n {
\n max = i;
\n }
\n }<\/p>\n
*pmaxchar = max;
\n *pmaxcnt = cnt[max];<\/p>\n
return 0;
\n} <\/p>\n
int main(void)
\n{
\n char filename[256] = {0};
\n int maxcnt = 0;
\n int maxchar = 0;
\n int ret = 0;<\/p>\n
printf("\u8bf7\u8f93\u5165\u8981\u68c0\u6d4b\u7684\u6587\u4ef6\u540d:\\\\n");
\n m_fgets(filename);<\/p>\n
ret = find_max_char(filename, &maxchar, &maxcnt);
\n if (ret != 0)
\n {
\n printf("fild max char failed\\\\n");
\n return -1;
\n }<\/p>\n
printf("\u51fa\u73b0\u6700\u591a\u7684\u5b57\u7b26:%c, \u6b21\u6570:%d\\\\n", maxchar, maxcnt);<\/p>\n
return 0;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb30\u6b21\u3002C\u8bed\u8a00\u6807\u51c6IO\u5e93(<stdio.h>)\u63d0\u4f9b\u9ad8\u6548\u7684\u6587\u4ef6\u64cd\u4f5c\u51fd\u6570\uff0c\u5305\u62ecfopen\/fclose(\u6587\u4ef6\u5f00\u5173)\u3001fgetc\/fputc(\u5b57\u7b26\u8bfb\u5199)\u3001fgets\/fputs(\u5b57\u7b26\u4e32\u8bfb\u5199)\u3001fscanf\/fprintf(\u683c\u5f0f\u5316\u8bfb\u5199)\u4ee5\u53cafread\/fwrite(\u4e8c\u8fdb\u5236\u8bfb\u5199)\u3002\u5176\u4e2d\uff0cfseek\/ftell\u7528\u4e8e\u6587\u4ef6\u5b9a\u4f4d\uff0cfread\/fwrite\u53ef\u5b9e\u73b0\u4e8c\u8fdb\u5236\u6587\u4ef6\u590d\u5236\u3002\u7edf\u8ba1\u6587\u4ef6\u5b57\u7b26\u9891\u7387\u7684\u4e24\u79cd\u5b9e\u73b0\u65b9\u6848\uff1a\u6570\u7ec4\u6cd5\u901a\u8fc7256\u7ef4\u6570\u7ec4\u76f4\u63a5\u7edf\u8ba1ASCII\u5b57\u7b26\u51fa\u73b0\u6b21\u6570\uff0c\u7b80\u5355\u9ad8\u6548\uff1b\u94fe\u8868\u6cd5\u5219\u52a8\u6001\u5b58\u50a8\u5b57\u7b26\u8282\u70b9\uff0c\u9002\u5408\u5904\u7406\u8d85\u5927\u5b57\u7b26\u96c6\u3002\u4e24\u79cd\u65b9<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174],"topic":[],"class_list":["post-54939","post","type-post","status-publish","format-standard","hentry","category-server","tag-c"],"yoast_head":"\n