Compilare: user.cpp: In function ‘int suma(int, int)’: user.cpp:15:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strchr(tabla[m][n],'=')==NULL) for(i=0;i<strlen(tabla[m][n]);i++) sum=sum*10+(int(tabla[m][n][i])-48); ^ user.cpp:18:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz<=strlen(tabla[m][n])) ^ user.cpp:13:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,nr=0,poz=1,nr2=0; ^ user.cpp: In function ‘int main()’: user.cpp:47:23: warning: unused variable ‘i2’ [-Wunused-variable] int i,j,n,k,p1,p2,i2; ^