97 строки
1.9 KiB
C++
97 строки
1.9 KiB
C++
#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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// Reading
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FILE *file = fopen("somefile.binary", "rb");
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assert(file);
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fseek(file, 0, SEEK_END);
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int size = ftell(file);
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rewind (file);
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printf("size: %d\n", size);
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char *buffer = (char*) malloc (sizeof(char)*size);
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assert(buffer);
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size_t read = fread(buffer, 1, size, file);
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assert(read == size);
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printf("data: %d", buffer[0]);
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for (int i = 1; i < size; i++)
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printf(",%d", buffer[i]);
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printf("\n");
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fclose (file);
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free (buffer);
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// Standard streams
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printf("input:%s\n", gets((char*)malloc(1024)));
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fwrite("texto\n", 1, 6, stdout);
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fwrite("texte\n", 1, 6, stderr);
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putchar('$');
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putc('\n', stdout);
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// Writing
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char data[5] = { 10, 30, 20, 11, 88 };
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FILE *outf = fopen("go.out", "wb");
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fwrite(data, 1, 5, outf);
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fclose(outf);
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char data2[10];
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FILE *inf = fopen("go.out", "rb");
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int num = fread(data2, 1, 10, inf);
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fclose(inf);
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printf("%d : %d,%d,%d,%d,%d\n", num, data2[0], data2[1], data2[2], data2[3], data2[4]);
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// Test reading a file that has not been cached
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FILE *other = fopen("test.file", "r");
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assert(other);
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char otherData[1000];
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num = fread(otherData, 1, 9, other);
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otherData[num] = 0;
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printf("other=%s.\n", otherData);
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// Seeking
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fseek(other, 2, SEEK_SET);
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num = fread(otherData, 1, 5, other);
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otherData[num] = 0;
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printf("seeked=%s.\n", otherData);
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fseek(other, -1, SEEK_CUR);
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num = fread(otherData, 1, 3, other);
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otherData[num] = 0;
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printf("seeked=%s.\n", otherData);
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fseek(other, -2, SEEK_END);
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num = fread(otherData, 1, 2, other);
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otherData[num] = 0;
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printf("seeked=%s.\n", otherData);
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fclose(other);
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// fscanf
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outf = fopen("fscan.f", "w");
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fprintf(outf, "10 hello");
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fclose(outf);
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int number;
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char text[100];
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inf = fopen("fscan.f", "r");
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num = fscanf(inf, "%d %s", &number, text);
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fclose(inf);
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printf("fscanfed: %d - %s\n", number, text);
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return 0;
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}
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