bankers

#include<stdio.h> 
struct pro{ 
int all[10],max[10],need[10]; 
int flag; 
}; 
int i,j,pno,r,nr,id,k=0,safe=0,exec,count=0,wait=0,max_err=0; 
struct pro p[10]; 
int aval[10],seq[10];  
void safeState() 
{ 
while(count!=pno){ 
safe = 0; 
for(i=0;i<pno;i++){ 
if(p[i].flag){ 
exec = r; 
for(j=0;j<r;j++) 
{ 
if(p[i].need[j]>aval[j]){ 
exec =0; 
} 
} 
if(exec == r){ 
for(j=0;j<r;j++){ 
aval[j]+=p[i].all[j]; 
} 
p[i].flag = 0; 
seq[k++] = i; 
safe = 1; 
count++; 
} 
} 
} 
if(!safe) 
{ 
printf("System is in Unsafe State\n"); 
break; 
} 
} 
if(safe){ 
printf("\n\nSystem is in safestate \n");

printf("Safe State Sequence \n"); 
for(i=0;i<k;i++) 
printf("P[%d] ",seq[i]); 
printf("\n\n"); 
} 
} 
void reqRes(){ 
printf("\nRequest for new Resourses"); 
printf("\nProcess id ? "); 
scanf("%d",&id); 
printf("Enter new Request details "); 
for(i=0;i<r;i++){ 
scanf("%d",&nr); 
if( nr <= p[id].need[i]) 
{ 
if( nr <= aval[i]){ 
aval[i] -= nr; 
p[id].all[i] += nr; 
p[id].need[i] -= nr; 
} 
else 
wait = 1; 
} 
else 
max_err = 1; 
} 
if(!max_err && !wait) 
safeState(); 
else if(max_err){ 
printf("\nProcess has exceeded its maximum usage \n"); 
} 
else{ 
printf("\nProcess need to wait\n"); 
} 
} 
void main() 
{ 
printf("Enter no of process "); 
scanf("%d",&pno); 
printf("Enter no. of resourses "); 
scanf("%d",&r); 
printf("Enter Available Resourse of each type "); 
for(i=0;i<r;i++){ 

scanf("%d",&aval[i]);
}
printf("\n\n---Resourse Details---"); 
for(i=0;i<pno;i++){ 
printf("\nResourses for process %d\n",i); 
printf("\nAllocation Matrix\n"); 
for(j=0;j<r;j++){ 
scanf("%d",&p[i].all[j]); 
} 
printf("Maximum Resourse Request \n"); 
for(j=0;j<r;j++){ 
scanf("%d",&p[i].max[j]); 
} 
p[i].flag = 1; 
} 
// Calcualting need 
for(i=0;i<pno;i++){ 
for(j=0;j<r;j++){ 
p[i].need[j] = p[i].max[j] - p[i].all[j]; 
} 
} 
//Print Current Details 
printf("\nProcess Details\n"); 
printf("Pid\t\tAllocattion\t\tMax\t\tNeed\n"); 
for(i=0;i<pno;i++) 
{ 
printf("%d\t\t",i); 
for(j=0;j<r;j++){ 
printf("%d ",p[i].all[j]); 
} 
printf("\t\t"); 
for(j=0;j<r;j++){ 
printf("%d ",p[i].max[j]); 
} 
printf("\t\t"); 
for(j=0;j<r;j++){ 
printf("%d ",p[i].need[j]); 
} 
printf("\n"); 
} 
//Determine Current State in Safe State 
safeState(); 
int ch=1; 
do{ 
printf("Request new resourse ?[0/1] :");
scanf("%d",&ch); 
if(ch) 
reqRes(); 
}while(ch!=0); 
//end:printf("\n"); 
}