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How to use fseek in C

#include <stdio.h> #include <stdlib.h> #include <string.h> int main(int argc, char* argv[]) { FILE* out; out = fopen("number.dat", "w"); if (out == NULL) { return 1; } fprintf(out, "20"); fseek(out, -2, SEEK_END); fprintf(out, "19"); return 0; }