(1)
int x,y;
x=3;
y=10*x+5;
printf("x=%d y=%d\n",x,y);
x++;
y=(10*x+5)/10;
printf("x=%d y=%d\n",x,y);

(2)
int x,x2,x3;
for (x=0;x<4;x++) {
    x2=x*x+2;
    x3=(x2*2+3)%5;
    printf("%3d %5d %7d\n",x,x2,x3);
}
printf("%3d\n",x);

(3)
int x,z;
z=0;
for (x=0;x<6;x++) {
    for (x=1;x<7;x++) {
        printf("%3d",z);
        z=z+1;
    }
    printf("\n");
}

(4)
int x=10,y=25,nn=0;
while (y<50) {
    y=y+x;
    nn++;
}
printf("%d %d %d\n",nn,x,y);

(5)
int n,i,j;
int k1,k2;
n=8;
for (i=0;i<n/2+1;i++) {
    k1=i;
    k2=n-2*k1+1;
    for (j=0;j<k1;j++) printf("$");
    for (j=0;j<k2;j++) printf("*");
    for (j=0;j<k1+2;j++) printf("#");
    printf("\n");
}

(6)
int nmb0,nmb,n,cnt;
int i;
nmb0=4000;
for (i=1;i<=2;i++) {
    nmb=nmb0*8*i;
    n=nmb;
    cnt=0;
    while (n%10==0) {
        n=n/10;
        cnt++;
        printf("n=%8d, ",n);
        printf("cnt=%2d\n",cnt);
    }
    printf("nmb=%6d  ",nmb);
    printf("cnt=%2d\n",cnt);
}