What compiler is doing when we pass unnecessary parameters in scanf

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What compiler is doing when we pass unnecessary parameters in scanf

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Hi, In the second scenario what value is it printing when i have given extra parameter in scanf? Does it vary from compiler to compiler? Scenario : I ------------- root@kaushik_Fedora11 ~/C/LET_US_C/ch-1> cat simple-interest.c #include void main () { int p; float i=0; printf ("enter the principal amount\n"); scanf ("%d",&p); i = (p*5*5)/100; printf ("Interterest is : %f\n",i); } root@kaushik_Fedora11 ~/C/LET_US_C/ch-1> ./a.out enter the principal amount 100 Interterest is : 25.000000 Scenario : II ------------- > cat simple-interest.c #include void main () { int p; float i=0; printf ("enter the principal amount\n"); scanf ("p:%d",&p); i = (p*5*5)/100; printf ("Interterest is : %f\n",i); } root@kaushik_Fedora11 ~/C/LET_US_C/ch-1> ./a.out enter the principal amount 100 Interterest is : -9321198.000000