matrice4.cpp: In function 'int prim(int)': matrice4.cpp:9: warning: unused variable 'j' matrice4.cpp:9: warning: unused variable 'd1' matrice4.cpp: In function 'int main()': matrice4.cpp:86: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result matrice4.cpp:92: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result