Compilare: user.cpp: In function ‘void schimb()’: user.cpp:12:9: warning: unused variable ‘n’ [-Wunused-variable] int n=strlen(s); ^ user.cpp: In function ‘void schimb2()’: user.cpp:75:9: warning: unused variable ‘x’ [-Wunused-variable] int x=-'A'+1; ^ user.cpp: In function ‘int fct()’: user.cpp:162:11: warning: unused variable ‘p’ [-Wunused-variable] char *p=strchr(s, s[0]); ^ user.cpp: In function ‘int main()’: user.cpp:177:19: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[strlen(s)-1]=NULL; ^ user.cpp:175:12: warning: unused variable ‘x’ [-Wunused-variable] int n, x=0; ^ user.cpp:176:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1001, f); ^ user.cpp:178:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &n); ^ user.cpp:186:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &c); ^