help in string manipulation (mikroc)

[asrock]

hello every one


i would ask you in issue i faced it when i make a simple prog....
if i have a string series such as
char st[10]="683664791"

here i want to get every character and convert it to integer to make on it some math operations...

the problem is : how i can get ceratin character in (st) !

here's my try:
char st[10]="683664791"
int num;

num=atoi(st[0]) // for example i want to get "6" and convert to int number
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but its not working


help me plz

 

[jayanth.devarayanadurga]

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Code C - [expand]
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unsigned int sum = 0, i = 0, j = 0;
unsigned number;
 
j = slrlen(st)-1; //if strlen = 8 then j = 7
 
while(st[i]){
    
    number = number + (st[i]-0x30)*10pow(j--);
    i++;
}
 
//number contains 68366471
 
/*
number = 0 + 6*10^7 = 60000000
number = 60000000 + 8*10^6 = 68000000
number = 68000000 + 3*10^5 = 68300000
number = 68300000 + 6*10^4 = 68360000
number = 68000000 + 6*10^3 = 68366000
number = 68000000 + 4*10^2 = 68366400
number = 68000000 + 7*10^1 = 68366470
number = 68000000 + 1*10^0 = 68366471
*/

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