C PROGRAMS SWAPPING 2 NOS WITHOUT USING TEMP VARIABLE main() { int a,b; a=40; b=20; printf("A=%d,B=%d",a,b); a=a*b; /* a=a+b; */ b=a/b; /* b=a-b; */ a=a/b; /* a=a-b; */ printf("\nA=%d,B=%d",a,b); } ADDTION WTHOUT USING '+' main() { int a,b,i; scanf("%d %d",&a,&b); for(i=1;i<=b;i++) a++; printf("sum of a and b : %d",a); } SUBTRACTION WITHOUT USING '-' main() { int a,b,i; scanf("%d %d",&a,&b); for(i=1;i<=b;i++) a--; printf("sub of a from b : %d",a); } MUL OF 2 NOS WITHOUT USING '*' main() { int a,b,i,ans=0; scanf("%d%d",&a,&b); for(i=1;i<=b;i++) ans=ans+a; printf("%d",ans); } FIBONACCI SERIES main() { int f1=-1,f2=1,f3,n,i; printf("Enter n "); scanf("%d",&n); printf("The fibo series is:\n"); for(i=1;i<=n;i++) { f3=f1+f2; printf(" %d ",f3); f1=f2; f2=f3; } } CHECK WHETHER THE GIVEN NO IS PRIME OR NOT main() { int n,i,div=0; scanf("%d",&n); for(i=1;i<=n;i++) if(n%i==0) div++; if(div==2) printf("\nGiven no %d is prime",n); else printf("\nGiven no %d is not prime",n); }
