Compilare: user.c: In function ‘main’: user.c:13:5: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] while(i!=(strlen(s)+2)) ^ user.c:13:15: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] while(i!=(strlen(s)+2)) ^ user.c:26:16: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] {for(i=0;i<strlen(s);i++) {{if(s[i]==':'&&s[i+2]=='"') {i+=3;while(s[i]!='"'){putchar(s[i]);i++;} printf(",");} ^ user.c:5:14: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] FILE *f,*g; ^ user.c:3:14: warning: unused variable ‘s2’ [-Wunused-variable] {char s[256],s2[256]; ^ user.c:9:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",s); ^ user.c:11:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:16:9: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:21:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:31:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,100,f); ^ user.c:13:12: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(i!=(strlen(s)+2)) ^